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• can't update 12.04 getting package header error

  - by joel

  I originally posted this question, and was redirected to another thread where the question had already been asked. I then posted to that thread and had my post deleted by moderator fossfreedom, and told to post a "new" question... so wth ever.... I don't care if it's old or new I just need help here people! In a nutshell, I can't use sudo apt-get update or the GUI update tool to update my system. Anytime I try using either tool it gives me an error about packages missing headers. I can't send error reports, I have tried all the listed solutions from this post: I can't update my system properly, "no package header" error and from this post: "Problem with MergeList" error when trying to do an update and neither one work. I just want a working solution since I don't have the means of re-installing the OS entirely, and I REALLY don't want to have to go back to using Windows.

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• Is the Spark View Engine for ASP.NET dead?

  - by AUser

  Is the Spark View Engine for ASP.NET dead? I'm considering using it for a new project. I tried to get approved to the Google Groups but nobody would approve me. The last message posted there was in May. I tried emailing the developers but nobody would reply back. I'm not having happy feelings about this using SPARK for a major project of mine at the moment. Is this project now dead especially after the Razor came out?

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• Ubuntu 12.04 crashes on startup for newer versions of Linux, possibly related to WiFi

  - by Jake

  My computer gets to the screen with the Ubuntu logo and the orange/white dots, and then the screen goes black, spits out a lot of error messages, and cannot boot. (If it'd be helpful, I can take a photo of my screen in this state.) I've found I can successfully boot if my wireless card is turned off. As soon as I turn it on, my computer crashes with the same black screen of death. I can also successfully boot if I choose "Previous Linux Version" and select a few versions back (I think 3.0.6). Here are some relevant details about my setup: Ubuntu 12.04 Computer: Lenovo x230 Wireless: Realtek RTL8188CE 802.11b/g/n WiFi Adapter Processor: Intel Core i5-3210M CPU @ 2.50GHz × 4 RAM: 16 GB of RAM Thank you!!!

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• Visual Studio 2010 & .NET 4.0 RC in Feb-2010

  Scott says, In order to make sure that these fixes truly address the performance issues reported, and to Other Interested articles…27 New Features of .NET Framework 4.022 New Features of Visual Studio 2008 for .NET Professionals50 New Features of SQL Server 2008IIS 7.0 New featureshelp validate them across the broadest number of scenarios and machine configurations, we’ve decided to ship another public preview release of VS 2010 and .NET 4 before we ship. Specifically, we plan to make a Release Candidate build available in February that everyone will be able to download and test. It will be a public build and include a broad “go live” license that supports production deployment.The goal behind the Release Candidate is to get broad feedback on the readiness of the product. In order to ensure that we are able to receive and react to this feedback, we will also be moving the launch of Visual Studio 2010 and .NET 4 back a few weeks.Continue span.fullpost {display:none;}

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• Am I getting Scheme wrong?

  - by nischayn22

  Inspired by the numerous posts about the importance of learning Lisp/Scheme I started to learn Scheme two days back, I am using the book "The little Schemer" and have completed half of it. But I still haven't learned anything new, the book teaches about recursion which I already understand and uses lambda (which I can think of a way to define a function in C). I still haven't got the concept of functional programming (please point to some example of functional compared to normal programming methods in C/C++ so I can get it). Am I learning in the wrong way? or is "The little Schemer" for a newbie in programming and I should look for some other books?

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• How to configure ubuntu for lightweight low-memory usage?

  - by augustin

  I just upgraded an old, secondary computer to the latest Kubuntu (10.10). It seems the effort was a bit too much for the hardware and one 512MB memory module died. I tried to take it away, clean the connectors, put it back several times, but to no avail. Until such a time I can find a second hand DDR memory module, I am left with a meagre 256MB RAM, which is below the official requirements (384MB) to run Kubuntu/KDE. Indeed: the computer constantly swaps the memory, making everything painfully slow. Since Kubuntu is already installed and I use it on all my computers (and I want to keep KDE for when I really need it), how can I configure ubuntu to squeeze out every bit of unnecessary memory usage? This is a secondary computer but still very useful. We use it mostly for web browsing. A "lightweight" tag is missing.

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• Best practice, or generally best way to set up web-hosting server, permissions, etc. [closed]

  - by Jagot

  Hi, I'm about to set up a server upon which a friend and I will be hosting web sites, and I'll be using Debian. I've set up a LAMP solution many times just to using for local testing purposes, but never for actual production use. I was wondering what are the best practices are in terms of setting the server up, in reference specifically to accessing the web root directory. A couple of the options I have seen: Set up a single user account on the server for us both to use and use a virtual host to point to the somewhere in the home directory, e.g. /home/webdev/www. Set each of us up a user account, and grant permissions in some way to /var/www (What would be the best way? Set up a new group?) I want to get this right when I first set this up as there won't be any going back for a while once our first site is up and running. Appreciate any guidance in advance.

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• Best options for freelance or part-time programming? [closed]

  - by Andrew

  I apologize in advance if this is an inappropriate question for this SE. A few years back I was all set to study computer science and get a job programming, but went a totally different route and went into healthcare. I currently work as a paramedic on a rotating 24/48 schedule, so I have two days off for every day I work, and a decent bit of downtime on the days that I do work. I've been looking at ways to earn some extra money with all that spare time, and was wondering if it'd be worth the effort to try and find a part-time/freelance gig. I know HTML/CSS, PHP, and I'm pretty familiar with Python and Ruby (and Rails). Anyways, was hoping that someone could point me in the right direction as what "skill set" would give me the best chance to be able to land a part-time/freelance gig. I realize this is a rather open-ended question but any direction is appreciated.

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• Visual Studio 2010 - Faster Startup with /nosplash

  - by MikeParks

  I read a blog the other day about the /nosplash switch in Visual Studio. Apparently, it's been around a while and I'm a little late on finding out about it. I figured I'd share it for those of you that come across this and didn't know about it as well. Basically all it does is turn off the Visual Studio splash screen which speeds up initial startup time. It's not a big difference but every little bit helps. I choose speed over looks. You can set the switch by right clicking on Visual Studio, selecting Properties, and adding "/nosplash" on the target Property, so it will look like this: "C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe" /nosplash. Feel free to try it out and see if you like it. You can always change it back by just removing the /nosplash switch when you're done testing. There are plenty more Visual Studio switches out there but this is the main one that came in handy for me.   - Mike

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• Slow Wireless Reconnect After Suspend

  - by nrhine1

  I a Broadcom 4312 using the STA drivers, I reinstalled ubuntu because the b43 drivers were giving me a huge hassle along with some weird kernel issues. My wireless speed is fine, everything works well, except upon restart of computer and after taking the computer out of suspend. It takes about 30-45 seconds for the wireless to reconnect, and I think it is a driver issue (I clicked on the network manager at the top and for about 30 seconds there are no wireless networks listed.) I tried this advice already: http://lilserenity.wordpress.com/2007/10/31/fix-ubuntu-dropping-wireless-on-suspendhibernate-resume/ which basically says to change this: STOP_SERVICES="" to STOP_SERVICES="networking" in the file /etc/default/acpi-support This did not help anything. Something to note is that the issue does not occur when I am logging back in after already logging in once and logging out.

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• The field for entering password freeze if no text is enter quickly after i install cinnamon on 12.04

  - by user109162

  Iam a total newbie to Ubuntu . I installed Cinnamon through terminal . The problem is that when i boot up, if i don't enter the password before 1 or 2 minutes the password field will freeze and won't accept any text inputs.The problem was most likely caused by Cinnamon because i guess the problem started after i tried to install some Cinnamon extensions. Please answer in non-technical way as far as possible. I will never go back to Windows whatever be the outcome. Help me stay on to Ubuntu.

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• Petstore using Java EE 6 ? Almost!

  - by arungupta

  Antonio Goncalves, a Java Champion, JUG leader, and a well-known author, has started building a Petstore-like application using Java EE 6. The complete end-to-end sample application will build a eCommerce website and follows the Java EE 6 design principles of simple and easy-to-use to its core. Its using several technologies from the platform such as JPA 2.0, CDI 1.0, Bean Validation 1.0, EJB Lite 3.1, JSF 2.0, and JAX-RS 1.1. The two goals of the project are: • use Java EE 6 and just Java EE 6 : no external framework or dependency • make it simple : no complex business algorithm The application works with GlassFish and JBoss today and there are plans to add support for TomEE. Download the source code from github.com/agoncal/agoncal-application-petstore-ee6. And feel free to fork if you want to use a fancy toolkit as the front-end or show some nicer back-end integration. Some other sources of similar end-to-end applications are: • Java EE 6 Tutorial • Java EE 6 Galleria • Java EE 6 Hands-on Lab

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• Getting the front buffer into a gfx mem surface (Dx9)

  - by lapin

  I'm using DirectX 9 to acquire the frontbuffer. There are a couple of ways I know of to get at the front buffer: GetRenderTargetData() GetFrontBufferData() The MSDN page on both of these API calls state that the data is copied from device memory to system memory. I'd like to copy the front buffer surface directly to another graphics memory surface, as I have other manipulations to perform on the acquired surface before returning it to system memory. I'm creating a D3DUSAGE_DYNAMIC texture (gfx mem texture) and calling GetFrontBufferData() to write the front buffer to my textures surface0. Is this valid? Will the operation remain in gfx memory, or will it need to move to system memory and then back to graphics memory? If this is the case, is what I'm trying to achieve possible?

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• New Java Tutorials Updated

  - by hinkmond

  The new Java Tutorials are here! The new Java Tutorials are here! So what? So, you can read them on your iPad thingie--if that's how you roll, that is... See: Read New Java Tutorials Here's a quote: What's New The Java Tutorials are continuously updated to keep up with changes to the Java Platform and to incorporate feedback from our readers. Recent updates include the following features: The Generics lesson has been completely reworked... The Java Tutorials are now available in two ebook formats: mobi ebook files for Kindle. ePub ebook files for iPad, Nook, and other eReaders that support the ePub format. Just kick back, open up your favorite tablet or eReader and learn all about the new things in the Java platform. Nice. All you need now is a cool drink and you're all set! Hinkmond

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• Logic or Algorithm to solve this problem [closed]

  - by jade

  I have two lists. List1 {a,b,c,d,e} and List2 {f,g,h,i,j} The relation between the two list is as follows a->g,a->h,h->c,h->d,d->i,d->j Now I have these two lists displayed. Based on the relation above on selecting element a from List1, List2 shows g,h. On selecting h from List2, in List1 c,d are shown in List1. On selecting d from List1 it shows i,j in List2. How to trace back to initial state by deselecting the elements in reverse order in which they have been selected?

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• Mouse pointer hides at bad times after updating to 13.10

  - by Richard

  A bug, I think, though I can't even seem to find any information when searching for it. The mouse pointer hides itself, but it is still possible to use it. Whenever I start watching a video in VLC, or start playing KSP through Steam my mouse pointer disappears. It is not returned upon exiting the application. I have not tried with other games in Steam. The mouse pointer do not disappear when watching videos online through YouTube, though it properly hides itself after a few seconds. The bug came about after I updated to 13.10, it was not present with the same setup in 13.04. I have tried removing ~/.compiz and restarting the kernel module psmouse. Going to tty1 and back to the desktop reveals the pointer, though this fix is bothering me. How do I fix this problem?

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• Identical spam coming from many different (but similar) IP addresses

  - by DisgruntledGoat

  A forum I run has been the victim of spam user accounts recently - several accounts that have been registered and the profile fill with advertising/links. All of this is for the same company, or group of companies. I deleted several accounts weeks ago and blocked some IP addresses, but today they have come back with the same spam. Every account has a different IP address, but they are all of the form 122.179.*.* or 122.169.*.*. I am considering blocking those two IP ranges, but there are potentially thousands of IPs in that range. They appear to be assigned to India (although the spam is for an American company) so given the site is for a western, English-speaking audience maybe it doesn't matter. My questions: How are they posting on so many IPs? Is there likely to be a limit to the number of IPs they have access to? Is there anything else I can do at the IP-level to block them? (I am looking into other measures like blocking usernames/links.)

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• What would one call this architecture?

  - by Chris

  I have developed a distributed test automation system which consists of two different entities. One entity is responsible for triggering tests runs and monitoring/displaying their progress. The other is responsible for carrying out tests on that host. Both of these entities retrieve data from a central DB. Now, my first thought is that this is clearly a server-client architecture. After all, you have exactly one organizing entity and many entities that communicate with said entity. However, while the supposed clients to communicate to the server via RPC, they are not actually requesting services or information, rather they are simply reporting back test progress, in fact, once the test run has been triggered they can complete their tasks without connection to the server. The request for a service is actually made by the supposed server which triggers the clients to carry out tests. So would this still be considered a server-client architecture or is this something different?

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• Why do most of us use 'i' as a loop counter variable?

  - by kprobst

  Has anyone thought about why so many of us repeat this same pattern using the same variable names? for (int i = 0; i < foo; i++) { // ... } It seems most code I've ever looked at uses i, j, k and so on as iteration variables. I suppose I picked that up from somewhere, but I wonder why this is so prevalent in software development. Is it something we all picked up from C or something like that? Just an itch I've had for a while in the back of my head.

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• Advanced Charts Part I

  - by Tim Dexter

  Yeeeep! Another series looms ... this one could stretch out a bit and more options become available. Ever needed to generate something similar to these? Beyond what BIP can provide today but there are a few options; one from Oracle and R, now out in the wild and another out there from JFreeChart, open source and therefore almost free. Of course Google is ever present and they have been extending their chart support. I blogged the How for Google charts a while back here. Different ways to integrate but they can all help to close the charting gap for you.

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• ubuntu 14.04 - only performance and powersave governor available (i5 4.gen)

  - by kinske

  After updating my ubuntu 13.10 to 14.04 there only these to govenors available for my cpu, instead of additionally ondemand and conservative. cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors performance powersave My cpu is a Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz, my laptop a LENOVO B5400 80B6QB0 and my kernel version is 3.14.1-031401-generic x86_64 Before updating the four governors were available. If this is important, I have installed tlp and indicator-cpufreq. How do I get back the missing two govenors? ondemand is really important to me because of power saving.

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• Web Based School/College ERP

  - by Ashok

  We are planning to build a Web Based School/College ERP. The main problem we face is Hardware support. Since it is Web Based, it is not possible to implement Biometrics. But most of our clients do ask for Biometrics. I hope we need to use a desktop application to do that. Can you please give some suggestions for this? Another thing is, here we don't have stable internet connection. We frequently face disconnection. This is another problem for Web Based CRM. In HTML5 there is a feature called Offline storage. Is it possible to use this feature for such dynamic ERP? For example, let's say we need to enter marks for the students. Net got disconnected. Is it possible to use HTML5 offline feature to save the marks offline and upload them when we got connection back?

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• How can I superscript a single character throughout my site?

  - by dvn66

  Finishing up development work for a client and they have a late request to superscript every occurrence of the &reg character throughout the site. I merely get by with CSS, but not even sure CSS provides the best solution here. how can I make a global change to every occurrence of a single character in the site copy without going back and adding tags everywhere? if the best solution does involve inserting a span or other tag I'm thinking it could be accomplished with a database query (all the copy is wired up to a CMS).

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• NVidia control panel SSAO not working

  - by János Turánszki

  I am just before implementing screen space ambient occlusion in my game, but first I wanted to try enabling it from NVidia control panel only to find out that it is greyed out so that I can not enable it. With this I could enable SSAO for some other games, but not every one. I know this technique requires the depth buffer and (optionally) a normal map texture to sample information from which I already have access to given I have a deferred renderer working. After that I actually thought to roll back to a previous version of my game which still uses forward rendering so the depth buffer is actually bound to the backbuffer which I render to from the get-go so that maybe the NVidia control panel would somehow make use of it. It was not working with forward rendering either. (I also tried FXAA in the control panel and that works - but it doesn't need any depth or normal texture) So my question is that how can I enable this function so that it would work by enabling it in the NVidia control panel?

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• Processing Text and Binary (Blob, ArrayBuffer, ArrayBufferView) Payload in WebSocket - (TOTD #185)

  - by arungupta

  The WebSocket API defines different send(xxx) methods that can be used to send text and binary data. This Tip Of The Day (TOTD) will show how to send and receive text and binary data using WebSocket. TOTD #183 explains how to get started with a WebSocket endpoint using GlassFish 4. A simple endpoint from that blog looks like: @WebSocketEndpoint("/endpoint") public class MyEndpoint { public void receiveTextMessage(String message) { . . . } } A message with the first parameter of the type String is invoked when a text payload is received. The payload of the incoming WebSocket frame is mapped to this first parameter. An optional second parameter, Session, can be specified to map to the "other end" of this conversation. For example: public void receiveTextMessage(String message, Session session) {     . . . } The return type is void and that means no response is returned to the client that invoked this endpoint. A response may be returned to the client in two different ways. First, set the return type to the expected type, such as: public String receiveTextMessage(String message) { String response = . . . . . . return response; } In this case a text payload is returned back to the invoking endpoint. The second way to send a response back is to use the mapped session to send response using one of the sendXXX methods in Session, when and if needed. public void receiveTextMessage(String message, Session session) {     . . .     RemoteEndpoint remote = session.getRemote();     remote.sendString(...);     . . .     remote.sendString(...);    . . .    remote.sendString(...); } This shows how duplex and asynchronous communication between the two endpoints can be achieved. This can be used to define different message exchange patterns between the client and server. The WebSocket client can send the message as: websocket.send(myTextField.value); where myTextField is a text field in the web page. Binary payload in the incoming WebSocket frame can be received if ByteBuffer is used as the first parameter of the method signature. The endpoint method signature in that case would look like: public void receiveBinaryMessage(ByteBuffer message) {     . . . } From the client side, the binary data can be sent using Blob, ArrayBuffer, and ArrayBufferView. Blob is a just raw data and the actual interpretation is left to the application. ArrayBuffer and ArrayBufferView are defined in the TypedArray specification and are designed to send binary data using WebSocket. In short, ArrayBuffer is a fixed-length binary buffer with no format and no mechanism for accessing its contents. These buffers are manipulated using one of the views defined by one of the subclasses of ArrayBufferView listed below: Int8Array (signed 8-bit integer or char) Uint8Array (unsigned 8-bit integer or unsigned char) Int16Array (signed 16-bit integer or short) Uint16Array (unsigned 16-bit integer or unsigned short) Int32Array (signed 32-bit integer or int) Uint32Array (unsigned 16-bit integer or unsigned int) Float32Array (signed 32-bit float or float) Float64Array (signed 64-bit float or double) WebSocket can send binary data using ArrayBuffer with a view defined by a subclass of ArrayBufferView or a subclass of ArrayBufferView itself. The WebSocket client can send the message using Blob as: blob = new Blob([myField2.value]);websocket.send(blob); where myField2 is a text field in the web page. The WebSocket client can send the message using ArrayBuffer as: var buffer = new ArrayBuffer(10);var bytes = new Uint8Array(buffer);for (var i=0; i<bytes.length; i++) { bytes[i] = i;}websocket.send(buffer); A concrete implementation of receiving the binary message may look like: @WebSocketMessagepublic void echoBinary(ByteBuffer data, Session session) throws IOException {    System.out.println("echoBinary: " + data);    for (byte b : data.array()) {        System.out.print(b);    }    session.getRemote().sendBytes(data);} This method is just printing the binary data for verification but you may actually be storing it in a database or converting to an image or something more meaningful. Be aware of TYRUS-51 if you are trying to send binary data from server to client using method return type. Here are some references for you: JSR 356: Java API for WebSocket - Specification (Early Draft) and Implementation (already integrated in GlassFish 4 promoted builds) TOTD #183 - Getting Started with WebSocket in GlassFish TOTD #184 - Logging WebSocket Frames using Chrome Developer Tools, Net-internals and Wireshark Subsequent blogs will discuss the following topics (not necessary in that order) ... Error handling Custom payloads using encoder/decoder Interface-driven WebSocket endpoint Java client API Client and Server configuration Security Subprotocols Extensions Other topics from the API

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