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• Unable to locate essential development tools Ubuntu 11.04

  - by Anita 7

  I'm using Ubuntu 11.04 (VMware). I aim to implement OpenMP. Im using gcc 4.5 compiler. I tried to install it by using the command sudo apt-get install gcc 4.5. Afterwards I proceed with gcc -fopenmp foo.c BUT the output was: gcc: foo.c: No such file or directory gcc: no input files –. Now I tried to install the package by using : ubuntu@ubuntu:~$ sudo apt-get install essential Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package essential. I also tried apt-cache search essential and after that sudo apt-get install essential-dev But the same error again, E: Unable to locate package essential-dev Any solution,please? Do I need to download any package? What should I do? Thank you in advance :))

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• Sharepoint 2010 can't find domain users when granting permissions

  - by quani

  I'm trying to grant permissions to other people to view a SharePoint site but when granting permissions it uses "Check Names" and claims any user or group that is part of a domain does not exist. It does this if I try granting permissions to the team site or in central admin BUT if I try to add someone to Farm Administrators in Central admin then all of the sudden it can find all domain users. Why is it finding domain users in that one context but not others? It is supposed to be using NTLM authentication and has Windows configured as the authentication provider (And IIS is configured to use NTLM). What's even more strange is I enabled Anonymous Access for the team site which I thought would allow anyone to view it but others say they can't access it.

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• Munin help... configure graphs to show different time periods

  - by PiZzL3

  I'm running a server with Munin installed through WHM cPanel. I've been googling around and I can't seem to find out how to do the following: A: Change a graph to show a different time period (currently I can only view, day, week, month, year). I would like to possibly view per minute, per hour... or specific intervals such as per 30 minutes, per 4 hours, etc... B(optional, but preferred): Add new graphs with the above criteria(A) above. I am a novice with all things that will possibly be required to do this (such as ssh). I wish I could just go edit a php file as I'm highly experienced in that subject. Thanks for any help!

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• OpenGL, objects disappear at a certain z distance

  - by smoth190

  I'm writing a managed OpenGL library in C++, and I'm having a pretty annoying problem. Whenever I set an objects position to -2.0 or lower, the object disappears. And at distances 0 through -1.9, it doesn't appear to move away from them camera. I have a world matrix (which is multiplied by the objects position to move it), a view matrix (which is just the identity matrix currently) and a projection matrix, which is setup like this: FOV: 45.0f Aspect Ratio: 1 zNear: 0.1f zFar: 100.0f using GLMs glm::perspective method. The order the matrices are multiplied by in the shader is world, view, projection, then position. I can move the object along the X and Y axis perfectly fine. I have depth testing enabled, using GL_LEQUAL. I can change the actually vertices positions to anything I want, and they move away from the camera or towards it perfectly fine. It just seems to be the world matrix acting up. I'm using glm::mat4 for the world matrix, and glm::vec3 for positions. Whats going on here? I'm also using OpenGL 3.1, GLSL version 140 (1.4?).

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• Quaternions, Axis Angles and Rotation Matrices. Which of these should I use for FP Camera?

  - by Afonso Lage

  After 2 weeks of reading many math formulas and such I know what is a Quaternion, an Axis Angles and Matrices. I have made my own math libary (Java) to use on my game (LWJGL). But I'm really confused about all this. I want to have a 3D first person camera. The move (translation) is working fine but the rotation isnt working like I need. I need a camera to rotate arround world Axis and not about its own axis. But even using Quaternions, this doesnt work and no matter how much I read about Euler Angles, everybody says to me dont touch on it! This is a little piece of code that i'm using to make the rotation: Quaternion qPitch = Quaternion.createFromAxis(cameraRotate.x, 1.0f, 0.0f, 0.0f); Quaternion qYaw = Quaternion.createFromAxis(cameraRotate.y, 0.0f, 1.0f, 0.0f); this.multiplicate(qPitch.toMatrix4f().toArray()); this.multiplicate(qYaw.toMatrix4f().toArray()); Where this is a Matrix4f view matrix and cameraRotate is a Vector3f that just handle the angles to rotate obtained from mouse move. So I think I'm doing everything right: Translate the view Matrix Rotate the Move Matrix So, after reading all this, I just want to know: To obtain a correct first person camera rotate, I must need to use Quaternios to make the rotations, but how to rotate around world axis? Thanks for reading it. Best regards, Afonso Lage

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• Unable to connect to sharedfax error

  - by Owl

  I'm running SBS2k on a machine with a 56k modem for all outgoing faxes. We have a terminal server running server 2003 enterprise and in printers the sharedfax shows "unable to connect status". When you right-click, properties, it gives you an error saying the spool service is not running and you cannot view properties. The spooler service is indeed running on the 2k3 server because I can view the other printer's properties..and on 2k I show the Microsoft Shared Fax service AND Print Spooler as started. Here's the tricky part, I can add the shared fax printer on a domain computer locally (Windows XP) and it will show ready status and I can send faxes, they show up on the 2k server's fax console manager as in progress. I've sent a couple from a few different workstations today successfully, but still unable to send from 2k3 terminal services.

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• Role based access to resources for a RESTful service

  - by mutex

  I'm still wrapping my head around REST, but I wonder if someone can help with any suggestions or approaches to role based access control for a RESTful service, particularly from the point of view of securing the data and how the URLs might look. It's probably best to consider an example: Say I have a REST service for Customers, and want to split the users of this REST service into Admin, Editor and Reader roles: Admins can change all attributes of a Customer resource Editors can change only some Readers can only view them. Access control rights are assigned to the Customers entities individually. So for example a user of the service might have admin rights to Customers 1,2 and 3 but Editor access to 4,5 and Reader access to 7,8,9. Now consider the user calling the service. What is a good way to seperate the list of Customers for the current User? GET /Customer - this might get a list of all customers that the current user has Admin\Editor\Reader access to. But then on each Customer the consumer would need an indication of what role they have. Or would it be "better" having something like GET /Customer/Admin - return all customers the current user has Admin access to. Just looking for some high level pointers or reading on a decent way to secure\filter the resources based on roles of the current user.

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• Why is my concurrency capacity so low for my web app on a LAMP EC2 instance?

  - by AMF

  I come from a web developer background and have been humming along building my PHP app, using the CakePHP framework. The problem arose when I began the ab (Apache Bench) testing on the Amazon EC2 instance in which the app resides. I'm getting pretty horrendous average page load times, even though I'm running a c1.medium instance (2 cores, 2GB RAM), and I think I'm doing everything right. I would run: ab -n 200 -c 20 http://localhost/heavy-but-view-cached-page.php Here are the results: Concurrency Level: 20 Time taken for tests: 48.197 seconds Complete requests: 200 Failed requests: 0 Write errors: 0 Total transferred: 392111200 bytes HTML transferred: 392047600 bytes Requests per second: 4.15 [#/sec] (mean) Time per request: 4819.723 [ms] (mean) Time per request: 240.986 [ms] (mean, across all concurrent requests) Transfer rate: 7944.88 [Kbytes/sec] received While the ab test is running, I run VMStat, which shows that Swap stays at 0, CPU is constantly at 80-100% (although I'm not sure I can trust this on a VM), RAM utilization ramps up to about 1.6G (leaving 400M free). Load goes up to about 8 and site slows to a crawl. Here's what I think I'm doing right on the code side: In Chrome browser uncached pages typically load in 800-1000ms, and cached pages load in 300-500ms. Not stunning, but not terrible either. Thanks to view caching, there might be at most one DB query per page-load to write session data. So we can rule out a DB bottleneck. I have APC on. I am using Memcached to serve the view cache and other site caches. xhprof code profiler shows that cached pages take up 10MB-40MB in memory and 100ms - 1000ms in wall time. Pages that would be the worst offenders would look something like this in xhprof: Total Incl. Wall Time (microsec): 330,143 microsecs Total Incl. CPU (microsecs): 320,019 microsecs Total Incl. MemUse (bytes): 36,786,192 bytes Total Incl. PeakMemUse (bytes): 46,667,008 bytes Number of Function Calls: 5,195 My Apache config: KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 3 <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 120 MaxRequestsPerChild 1000 </IfModule> Is there something wrong with the server? Some gotcha with the EC2? Or is it my code? Some obvious setting I should look into? Too many DNS lookups? What am I missing? I really want to get to 1,000 concurrency capacity, but at this rate, it ain't gonna happen.

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• Expected time for lazy evaluation with nested functions?

  - by Matt_JD

  A colleague and I are doing a free R course, although I believe this is a more general lazy evaluation issue, and have found a scenario that we have discussed briefly and I'd like to find out the answer from a wider community. The scenario is as follows (pseudo code): wrapper => function(thing) { print => function() { write(thing) } } v = createThing(1, 2, 3) w = wrapper(v) v = createThing(4, 5, 6) w.print() // Will print 4, 5, 6 thing. v = create(7, 8, 9) w.print() // Will print 4, 5, 6 because "thing" has now been evaluated. Another similar situation is as follows: // Using the same function as above v = createThing(1, 2, 3) v = wrapper(v) w.print() // The wrapper function incestuously includes itself. Now I understand why this happens but where my colleague and I differ is on what should happen. My colleague's view is that this is a bug and the evaluation of the passed in argument should be forced at the point it is passed in so that the returned "w" function is fixed. My view is that I would prefer his option myself, but that I realise that the situation we are encountering is down to lazy evaluation and this is just how it works and is more a quirk than a bug. I am not actually sure of what would be expected, hence the reason I am asking this question. I think that function comments could express what will happen, or leave it to be very lazy, and if the coder using the function wants the argument evaluated then they can force it before passing it in. So, when working with lazy evaulation, what is the practice for the time to evaluate an argument passed, and stored, inside a function?

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• Architectural advice - web camera remote access

  - by Alan Hollis

  I'm looking for architectural advice. I have a client who I've built a website for which essentially allows users to view their web cameras remotely. The current flow of data is as follows: User opens page to view web camera image. Javascript script polls url on server ( appended with unique timestamp ) every 1000ms Ftp connection is enabled for the cameras ftp user. Web camera opens ftp connection to server. Web camera begins taking photos. Web camera sends photo to ftp server. On image url request: Server reads latest image on hard drive uploaded via ftp for camera. Server deleted any older images from the server. This is working okay at the moment for a small amount of users/cameras ( about 10 users and around the same amount of cameras), but we're starting to worrying about the scalability of this approach. My original plan was instead of having the files read from the server, the web server would open up an ftp connection to the web server and read the latest images directly from there meaning we should have been able to scale horizontally fairly easily. But ftp connection establishment times were too slow ( mainly due to the fact that PHP out of the ox is unable to persist ftp connections ) and so we abandoned this approach and went straight for reading from the hard drive. The firmware provider for the cameras state they're able to build a http client which instead of using ftp to upload the image could post the image to a web server. This seems plausible enough to me, but I'm looking for some architectural advice. My current thought is a simple Nginx/PHP/Redis stack. Web camera issues post requests of latest image to Nginx/PHP and the latest image for that camera is stored in Redis. The clients can then pull the latest image from Redis which should be extremely quick as the images will always be stored in memory. The data flow would then become: User opens page to view web camera image. Javascript script polls url on server ( appended with unique timestamp ) every 1000ms Camera is sent an http request to start posting images to a provided url Web camera begins taking photos. Web camera sends post requests to server as fast as it can On image url request: Server reads latest image from redis Server tells redis to delete later image My questions are: Are there any greater overheads of transferring images via HTTP instead of FTP? Is there a simple way to calculate how many potential cameras we could have streaming at once? Is there any way to prevent potentially DOS'ing our own servers due to web camera requests? Is Redis a good solution to this problem? Should I abandon PHP/Ngix combination and go for something else? Is this proposed solution actually any good? Will adding HTTPs to the mix cause posting the image to become too slow? Thanks in advance Alan

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• I want to use Windows 8 from within Ubuntu

  - by sus hill

  I have a CD of windows 8. I bought a laptop which has a windows 7 OS but I removed it to use Ubuntu 12.04 but for some of the programs I need Windows 8 without separate partitions. I heard about vmware and how it can help to run the OS insideanother. As I have only allocated 50GB for Ubuntu 12.04 64bit, which I am using right now, I want to use windows 8 from within my Ubuntu 12.04. Could anyone help? Thank you very much.

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• Connect to a VPN from a Virtual Machine

  - by kaharas

  I am running an Ubuntu ditro inside a VMWare virtual machine with a bridged connection on a windows 7 host. What I am trying to do is to have the virtual machine connect to a VPN, but I'm not having much success. At first, the system was using wicd, but I replaced it with network-manager who's supposed to have OpenVPN support. The problem is, even tho i've purged the wicd installation, there're connections shown in the network manager, and still, I'm able to access the net. I've also added the openvpn data in the network manager tab, but it's shown as never used. PS: when I try to stop and start the NetworkManager service, an error message pops up telling me that there's not such a service, but apt-get tells me i've already installed it...

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• Why is my library/Documents shortcut showing all files from all subfolders in one flat list?

  - by korro

  I am using Windows Explorer on Windows 7. In My Documents there's a folder 02 KOOP. If I go there using the adress bar: D:\users\username\My Documents\02 KOOP I get a view of my subfolders and some files: However when I use the Documents shortcut under Libraries, and then go to the 02 KOOP folder, all files that are located in all subfolders are listed in one big list. When you view the file properties, the actual location is shown: This is the only subfolder of My Documents that has this behaviour. Did I accidentally change some setting, or is something wrong? Is this some setting I accidentally changed?

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• AngularJS dealing with large data sets (Strategy)

  - by Brian

  I am working on developing a personal temperature logging viewer based on my rasppi curl'ing data into my web server's api. Temperatures are taken every 2 seconds and I can have several temperature sensors posting data. Needless to say I will have a lot of data to handle even within the scope of an hour. I have implemented a very simple paging api from the server so the server doesn't timeout and is currently only returning data in 1000 units per call, then paging through the data. I had the idea to intially show say the last 20 minutes of data from a sensor (or all sensors depending on user choices), then allowing the user to select other timeframes from which to show data. The issue comes in when you want to view all sensors or an extended time period (say 24 hours). Is there a best practice of handling this large amount of data? Would it be useful to load those first 20 minutes into the live view and then cache into local storage something like the last 24 hours? I haven't been able to find a decent idea of this in use yet even though there are a lot of ways to take this problem. I am just looking for some suggestions as to what might provide a good balance between good performance and not caching the entire data set on the client side (as beyond a week of data this might not be feasible).

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• Test JPQL with NetBeans IDE 7.3 Tools

  - by Geertjan

  Since I pretty much messed up this part of the "Unlocking Java EE 6 Platform" demo, which I did together with PrimeFaces lead Çagatay Çivici during JavaOne 2012, I feel obliged to blog about it to clarify what should have happened! In my own defense, I only learned about this feature 15 minutes before the session started. In 7.3 Beta, it works for Java SE projects, while for Maven-based web projects, you need a post 7.3 Beta build, which is what I set up for my demo right before it started. Then I saw that the feature was there, without actually trying it out, which resulted in that part of the demo being a bit messy. And thanks to whoever it was in the audience who shouted out how to use it correctly! Screenshots below show everything related to this new feature, available from 7.3 onwards, which means you can try out your JPQL queries right within the IDE, without deploying the application (you only need to build it since the queries are run on the compiled classes): SQL view: Result view for the above: Here, you see the result of a more specific query, i.e., check that a record with a specific name value is present in the database: Also note that there is code completion within the editor part of the dialog above. I.e., as you press Ctrl-Space, you'll see context-sensitive suggestions for filling out the query. All this is pretty cool stuff! Saves time because now there's no need to deploy the app to check the database connection.

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• Why do control keys (ctrl, shift, alt) not work sometimes?

  - by EricSchaefer

  Sometimes (about once a week) the control keys (ctrl, shift, alt) so not work anymore. They do work when I boot up, but after a while they stop working. Logging out and in again repairs it. What can cause something like that? Edit: It just happened again. Incidentally it happened right after vmware-player crashed just as the last time. Coincidence? Edit: It is a laptop keyboard (HP EliteBook 8730w) with german layout.

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• DualBoot 32Win & 64Mac from Live USB +Persistance

  - by josephsmendoza

  So I have a 32 bit Live USB with persistance that I use to write code, cause that's just how I roll. I can boot it onto my school computers(32 bit Win) no problem, but obviously not my Mac (2007 iMac, 64 Bit). Currently I use VMWare Fusion 6 Pro and a Plop Linux image to use the usb at home, but I can only get 900mb of ram for my VM. I was hoping to make a Live USB that can boot 32 bit and 64 bit for mac, with a shared persistance file, this way I can use my computer's full 2GB. Also, I'm not allowed edit any part of this Mac. Do Not reply telling me it's impossible. Please only solutions. Thank you, and have a unicorntastic day!

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• I can't log-in to WinSCP using username "root"

  - by Jessyle Ivy

  I can't log-in to WinSCP using username "root". I already change the password of "root" in Ubuntu, and I successfully log-in there. But in WinSCP, it goes like this Search for host... Connecting to host... Authenticating... Using username "root" Authenticating with pre-entered password. Access Denied. and I am need to re-type the password again. By the way I'm using VMware Player for Ubuntu. Thanks!

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• no ui or default configuration found?

  - by user51447

  I created a custom Ubuntu 11.10 amd64 desktop based distro using remastersys, but whenever I try to boot using the iso file in vmware, it shows this error : no ui or default configuration found I've tried changing the name of isolinux to syslinux but that didnt help me either! I also tried using unetbootin but it also doesnt boot, and tried every possible but to no avail. There is a similar question but it is about 10.10 and 32 bit, but that didnt solve my query and also as this is a custom distro, the solution could be different. I've also tried creating images using remastersys again and again but that wont help either. Please help me its very urgent!

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• Copying Tables from a Website

  - by amemus

  I have difficulty making an Excel-readable file from a table on a Website. The problems very specific to my question are: I have to use IE 7 to access the site. Excel is installed in another computer. The site does not let me view the HTML of the table. Normally, I would simply select the table I want and drag and drop it to Excel. Or, I would view the page source and copy the HTML data. Both do not work in this case. Is there any handy tool out there?

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• What is the preferred/recommend way of running two version of ubuntu side by side

  - by GreyGeek

  I am running 14.04, but I need to run some corporate software/scripts that have been specifically designed for 12.04. I am aware of virtual box/vmware for full virtualization but I am looking for something more lightweight (on my windows machine both come at a significant cost in battery life) closer to os virtualization level. Ideally, I would like something like windows 7/8 compatibility mode: the ability to run a program as if I were on 12.04. Does Ubuntu/Linux have such mechanism? What is the preferred way of running programs/scripts designed for an older version of Ubuntu?

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• UCS Documentation: Home1 or Home2? You Decide.

  - by joesciallo

  How you go about finding information can be a very personal affair. We each have our own style of locating content, we each have our particular bent. But when it comes to getting started finding technical information, sometimes the simplest ways are best, especially if you are relatively new to a product or technology, and you just need to get going quickly with that Installation Guide or those Release Notes. With that in mind, I recently created an alternative home page for the Unified Communications Suite documentation. You can now have your Home2, in addition to the original, more wiki-fied Home1. I would recommend Home2 for those who are used to, and are more comfortable with, the spreadsheet-like view of manuals: here you'll find those familiar titles and the option to either view on the wiki or download the equivalent PDF file. Once you get familiar with what guides are available for the UCS component products, then move on to the Home1 layout, and start using some of the more advanced techniques for finding content in a wiki. Either way, you should be able to locate the "thing" you are looking for.

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• What companies do what I'm interested in? [closed]

  - by Alex

  I'm a systems guy. People change their concentrations to avoid taking operating systems, while I took it during my first semester after transferring. I'm taking compilers and networks now, and I think they're awesome. And yet there are so many job postings looking for people to do work in things like web development, and so few postings looking for people to work in kernel hacking or network engineering. What sorts of companies do these things? I'm currently awaiting a contract in the mail for an internship with VMWare, so I'm not out of a job for the summer. Still, I'd like to companies do these things.

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• Missing Firefox app icon

  - by frozenkoi

  I'm using Ubuntu 11.04 (upgraded from LTS 10.04) and Firefox (version 11) doesn't show it's icon in the Window List panel, in the Firefox window top left corner (system menu) nor when using ALT+TAB to switch applications. I'm using unity 2D since I'm running ubuntu as a guest in a VMWare virtual machine (Host is windows 7) Instead of the Firefox icon I get what appears to be a generic icon that looks like an app window in the window list and a black rectangle with a curl in the bottom right corner in the ALT+TAB window. How do I fix this so that the proper Firefox icon gets displayed? EDIT: Depending on the icon set chosen in the Appearence settings window sometimes I get the icon, sometimes I don't. When using Ubuntu classic none of the icon sets provide the icon for Firefox.

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• Is there a config value in Wine to force Enter to send CR+LF?

  - by bedwyr

  I'm pretty new to Wine and I'm trying to use an IM client which is required for my work. When I hit 'Enter' to send a chat message, the characters indicating a new line are not being correctly interpreted. Here's a basic SYN-ACK between the two of us: His view: me: SYN!him: ACK! My view: him: SYN!me: ACK!me: ACK! Is there any way I can configure Wine to handle this correctly? Please note: this is a required application and I have no way to change its configuration.

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