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• How do I troubleshoot system slowness seen when viewing PDFs or videos?

  - by asp

  Whenever I watch videos, either online of local via Totem and/or open PDF files using evince. The system gets really, really bogged down. All apps get really slow, menus take forever to display, switching windows gives me time to make a coffee, etc. I have a couple of bug reports open on this, but what do I need to do to really troubleshoot the issue? I've purged Adobe Flash from the system, but YouTube HTML5 videos still have the issue. A bunch of PDFs saved locally trigger the problem. And to (temporarily) remove the slowness, I need to shutdown the computer, breath for a few minutes, then restart. A simple reboot does not do the trick. How can I identify the cause? This only started on 13.04. I've had Ubuntu on this machine for a year without a problem until "upgrading" to 13.04. I am not a programmer, but I suspect an issue with the Intel video driver. Is there something I can run which will diagnose this, or are there concrete steps I can follow to find the culprit?

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• Why do most routers not include local DNS?

  - by user785194

  I need to change my firewall/router, and I'd prefer something with built-in DNS to resolve queries on the local subnets. I've got a mixed Linux/Windows system, often with only one computer turned on, and I frequently have problems resolving local names. I don't want to keep a Linux box permanently on just for DNS, and I'd prefer to have DNS in my router appliance, which is always on. I search Google for this occasionally but never find anything. You always get the obvious answers - it's not possible, put everything in /etc/hosts, NetBIOS, dedicated box, etc. So what am I missing? Why don't "cheap" routers let you do this? I'm pretty sure that Cisco kit does this. Almost all cheap routers will let you do MAC address reservation, to let them assign static IP addresses for DHCP. So why can't they simply do DNS as well for everything on the local subnets, just passing through remote domains to the ISP?

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• Firefox generating error?

  - by Lynda

  I run Firebug on my computer since I develop websites. And I have been noticing this error consistently with every page I go to and I am lost as to what it is and believe it might be Firefox causing this error. Has anyone seen it before? Here is the error: An exception occurred. Traceback (most recent call last): File "resource://jid1-g0j5yenav9jwla-at-jetpack-api-utils-lib/tabs/tab.js", line 254, in null .getInterface(Ci.nsIWebNavigation) Error: Permission denied for <http://superuser.com> to create wrapper for object of class UnnamedClass

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• How computers display raw, low-level text and graphics

  - by panic

  My ever-growing interest in computers is making me ask deeper questions, that we don't seem to have to ask anymore. Our computers, at boot, as far as I understand it, are in text mode, in which a character can be displayed using the software interrupt 0x10 when AH=0x0e. We've all seen the famous booting font that always looks the same, regardless of what computer is booting. So, how on earth do computers output graphics at the lowest level, say, below the OS? And also, surely graphics aren't outputted a pixel at a time using software interrupts, as that sounds very slow? Is there a standard that defines basic outputting of vertices, polygons, fonts, etc. (below OpenGL for example, which OpenGL might use)? What makes me ask is why OS' can often be fine without official drivers installed; how do they do that? Apologies if my assumptions are incorrect. I would be very grateful for elaboration on these topics!

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• Vista: "Change date and time" causes permissions error

  - by alexsome

  I double-click on the time in the bottom right to open the date and time panel. Then I click on the "Change date and time..." button (which has a shield) and I get the UAC dialog. I click "Continue", then am presented with an error that reads: Unable to continue You do not have permission to perform this task. Please contact your computer administrator for help. I will mention I have Comodo installed, but I have turned it off to test this out and I get the same results. All that I've found while googling were suggestions to turn UAC off, but I am interested in learning what the actual problem is. Thanks in advance.

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• View scheduled recordings remotely

  - by Scott

  I have one computer which is equipped with a TV tuner card. The Recorded TV folder is shared so that other computers on the network can watch recordings. Now that I am upgrading my computers to Windows 7, they have Media Center, which makes for a nicer viewing experience than a Windows Explorer folder view. I have set up Media Center on my laptop to considering the Recorded TV folder on the tuner-equipped PC as an extended library location, so now I can view all the recordings from within Media Center on the laptop. To make this experience even better, is there a way to view the list of scheduled recordings on the tuner-equipped PC from within Media Center on my laptop?

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• Failed 11.10 to 12.04 upgrade and drove me crazy!

  - by Ivan

  Please help me with this! I first tried to upgrade my Ubuntu server from 11.10 to 12.04 thru Upgrade Manager, but never succeeded! Then I tried upgrading thru terminal, which took me ~4 hours as I was warned. When I restarted my computer, my login GUI did not show up at all! (Panic I was!) But when I switched to tty6 and it seemed the upgrade has finished, at least partially and got message Ubuntu 12.04LTS and telling me 12.10 is available. There are bunch of unmet dependencies...."apt-get install -f" may resolve the problem. Then I tried: sudo apt-get -f install, did not succeed! Also I tried sudo apt-get update && sudo apt-get upgrade I got bunch of error message too long to list here. Then I tried: sudo do-release-upgrade still bunch of error message there! There seems a lot trouble with the upgrade from 11.10 to 12.04 for me. Did I miss anything? Anyway, can I ask how I can get the gnome login GUI back? Thanks a lot! Yifang

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• Installing Oracle11gr2 on redhat linux

  - by KItis

  I have basic question about installing applications on linux operating system. i am going to express my issue considering oracle db installation as a example. when installing oracle database , i created a user group called dba and and user in this group called ora112. so this users is allowed to install database. so my question is if ora112 uses umaks is set to 077, then no other uses will be able to configure oracle database. why do we need to follow this practice. is it a accepted procedure in application installation on Linux. please share your experience with me. thanks in advance for looking into this issue say i install java application on this way. then no other application which belongs to different user account won't be able use java running on this computer because of this access restriction.

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• Is it possible reinstall packages in Ubuntu without an internet connection?

  - by javamatt

  Hi everyone, While experiencing some massive problems with MYSQL, I completely removed a package called rsyslog, and I can no longer get on the internet to use the package manager to correct my mistake. I also got rid of librdf0 as well (oops). I would like to download the missing packages onto a CD with another computer, and manually reinstall them on my Ubuntu platform. Any ideas where to find these? (I am assuming this is the package I need. Either way, I still need to get access to the correct packages and install them). Thank you all very much in advance. Matt

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• Enable System Beep in Ubuntu

  - by Melissa W

  I have tried and tried to get the system beep working, but with no success. I have selected System--Sound--System Beep--Enable Audible Beep (from the Gnome Desktop) I have tried from a Terminal window Edit--General Tab--Selecting terminal bell checkbox I have tried entering modprobe pcspkr at the command line. Trying echo -e '\a' or using the beep application - Nothing works! I know my hardware speaker works, because if on startup the battery is low it will beep. Update: It is a laptop computer. It is an IBM Thinkpad, iSeries. I did look at the modprobe blacklist, and pcspkr was not listed.

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• remote desktop connection help?

  - by robin agrahari

  sir, i have created a web application in eclipse,db2 database server is running on my pc.so i can access the web application through the address http://localhost:8080/LimsWeb i used team viewer software to establish a remote desktop connection. can my friend somehow connect to my pc so that when he types the above url in his browser he will be able to fetch the pages of the application. i was able to do this by connecting with remote desktop mode.but in that case my friend was able to use the application which i created running on my pc only and in the window provided by team viewer.i want that he can run the application on his own computer calling the given url from his own browser. please help

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• Problem with PPTP VPN and internet

  - by Enriquev

  Hello, I have an internet connection the following way : Internet Modem <- FireWall(not a router, a firewall) <- PC Everything is setup so my pc has an external ip address, and my firewall takes care of blocking bad stuff. I connect by VPN to an external network, so I added a new connection using Windows Xp's "New connection wizard" (the vpn client that comes with Windows XP), it's a PPTP connection so I used all default settings. I put the PPTP server's IP, my username and password and I succesfully connected. I was able to have access to the external VPN ressources. The only problem is everytime I connect to this VPN, my computer cannot connect to the web anymore, no msn, no ping, no web. Is there anything special I should be doing?

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• How to delete "System Volume Information" folder from external drives?

  - by Nadude

  I'm running Vista Prof 32bit on a lenovo w500 thinkpad. I have four external drives and use 4 different PCs, that all have system volume information folders, taking up lots of space, and I can't delete them. I don't even know which computer's files are backed up on which external. I've used Thinkvantage rescue and recovery to delete all backups, as well as checked system restore settings to only use my main C drive. I checked all the PC's to ensure only the Main drive keeps system restore points and deleted previous versions. I ran Disc Clean up too. But I can't figure out how to get rid of these large folders from my external drives.

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• Update Manager got stuck (but not frozen) while installing downloaded updates. What should I do?

  - by WarriorIng64

  I have just gotten my Ubuntu 12.04 LTS desktop computer reassembled after a trip back home and connected it to my parent's wireless Internet connection. The connection seems quite shaky (disconnects half the time, likely an ongoing issue with the wireless card I have installed), and it struggled to download updates because of the constant interruptions. Eventually, it managed to download the updated packages and started installing them. I got up and left it to do its work. When I came back, I saw it was still having trouble staying connected to the wireless (no surprise there), but then I noticed that it seemed like Update Manager had stopped making progress on the installation. I opened the Details pane to see what it was last doing: My guess was that the installation script for flashplugin-installer couldn't complete the download until I stabilized the Internet connection. I hooked my Ubuntu laptop up to my desktop via Ethernet and shared its wireless connection using this guide, and as I am typing this now from my desktop you can see that the connection issue was successfully worked around. However, even with a stable connection established, Update Manager seems "stuck" at its current position and won't go any further. It's not totally frozen, but I can't do anything beyond open/close the Details pane as the Cancel button is grayed out. I know it can cause big problems if updates are stopped during installation, but I'm at a loss as to how this situation should be handled. I'm sure it should finish normally if I can just find a way to restart Update Manager, but the question is how this should be approached. How can I safely get my updates to finish installing?

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• Remotedesktop to windows 2008 server with 2 nics

  - by The_Mo

  Hi I have 2 NICs on a Windows 2008 R2 Server. nic1 with ip address 192.168.2.1 with gatewaty 192.168.2.254 and nic2 with ip address 10.96.6.253 with no gateway. The windows 2008 server is connected to a router which is connnected to another router so if I want to connect to the windows 2008 server I use 192.168.0.31 because it is forwarded. If I use remote desktop to connect to that machine I use 192.168.0.31 and that works well, but the server has a seccond nic and I want to be able to connect with a remotedesktop to nic2. Any help appreciated! [server windows 2008 r2 192.168.2.1] -- [router 192.168.2.254/192.168.0.31] -- [my computer 192.168.0.13 gateway 192.168.0.254]

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• Is there any way to facilitate switching windows in Ubuntu?

  - by Ivan

  I'm just a student who received my laptop from my uncle, who's a coder, so I'm still getting used to working with ubuntu. I recently upgraded ubuntu from an earlier version, and everything seems to be pretty great. The only thing is that when I open a program, or file, or whatever, it takes up the whole screen. I can only close it by going to the far top left of my screen, or by ctrl+W. Anyways, I find it really hard to switch between programs. For example I really like to have my windows that are open to be accessible by clicking on their icon at the bottom of the screen... Great when writing or researching. Anyways, I really just want to find an easier way to switch windows. Also, I used to love the way I could cube-rotate my screen, and just drag files from one desktop to another, with compiz. Now, its sort of like flipping a coin when I switch windows, is there any way to get my desktop cube back? And yes, I have enabled all the old settings I used to use with compiz. Sorry if what I'm asking is very basic, I know how to use a computer, I'm just not really familiar with the interface! Any help is greatly appreciated.

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• Sniff packets using tcpdump

  - by denisk

  I have a completely noob question. I want to see all packets that come to my computer from particular site (google.com). So I start tcpdump sudo tcpdump -i eth0 host google.com and enter google.com in a browser and hit enter - nothing gets captured. I can't figure out why it happen. What do I do wrong? Edit It appeared that I was listening to the wrong interface. I had changed eth0 to any and it worked. It was ppp1 that needed listening. Thanks for your answers!

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• Prevent Java application from accessing/monitoring/altering clipboard contents

  - by mcstrother

  I'm a student using a service that provides practice questions for standardized tests. The service requires that I access the questions by downloading and running a Java application. If I try to copy anything from any window of my computer (including applications unrelated to the question bank) while the application is running, the copied item is replaced with an obnoxious message asking me to not pirate their copyrighted material. I find this obnoxious, and I also really don't like the idea that any application can slurp up any and all potentially sensitive information that I happen to copy while it's running. Is there are a way to limit the privileges of this application to stop it from doing this? Thank you!

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• Trojan infection help please

  - by brandon

  Hey, I was browsing some websites and somehow obtained a trojan through some sort of silent download. Google Chrome started acting funny and wouldn't load web pages and neither would internet explorer. Only Firefox worked. I rebooted my computer and as usual logged into my email account as well as my bank account online completely forgetting about the infection. Could my information have been sent to the person or people or wrote the trojan? I downloaded Zone Alarm and took care of the issue, I'm just worried about when I absentmindedly logged into my email account and bank account online while I was infected.

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• Why does booting from a 64 bit Win 8 USB install work on a 32 bit laptop?

  - by Arabella

  I upgraded a 64 bit Windows 7 laptop to Windows 8 through the Upgrade Assistant, creating a bootable USB without any problems. I installed it successfully. Before I purchased an upgrade for my 32 bit Windows 7 laptop, I decided to boot from the USB with the 64 bit ISO to see what happened. The Windows 8 install screen came up with all the options. Should it not have detected that the laptop is 32 bit and therefore the install should have given an error? I cancelled the install before it did anything, but now I want to know if I need to download the iso again after purchasing the upgrade on my 32 bit laptop? I've read the answers to this question, which confirms what is said in this article - a 32 or 64 bit iso will be downloaded depending on the hardware of the computer you are upgrading. If that is the case, then why did it boot into the install screen?

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• Ubuntu 11.10 loads from live usb fine, but boots to black screen from harddrive. Why?

  - by Estel

  A few days ago I had a hard drive failure, which was running Windows XP (32-bit) just fine. The second hard drive in my computer held a few unimportant files, so I formatted it in the Ubuntu setup and installed 11.10 without a hitch. I had been using it for about a week, but decided to install Windows 7 (64-bit) in order to utilize Networking with my home server (running Windows Server 2000). My system is 64-bit based, and thus I had no problems installing other than a basic RAM error that required me to remove my RAM down to a single stick. I played with the settings in Windows 7 for around an hour before I shut down. After reinstalling the RAM, Windows 7 would not boot. In this, I then assumed that something about my system was rejecting Win7 and I reinstalled Ubuntu. However, now Ubuntu (11.10) boots into black screen, and I've already attempted activating the grub menu with the shift key, and following steps listed here: https://wiki.ubuntu.com/X/Troubleshooting/BlankScreen but nothing seems to work. I've reinstalled twice now, with the same result each time. Now, the very odd part about this whole scenario is that the USB I installed from has no problems booting as a live USB. This puzzles me greatly, because the hard drive boots straight to black screen and the live USB loads normally. At this point, my only theory is that the boot sector of the hard disk was somehow corrupted with Win7, and that Ubuntu was unable to completely write through. I used Darik's Boot n Nuke to wipe the drive, but was met with an error, this also puzzles me because the hard disk has no promblems reading or writing. Any suggestions/comments are appreciated. If you have a theory, I will be more than happy to oblige. Additional information: Intel Core2 Duo e6400 2.13GHz nVidia GeForce 7-series (7900 GS) 4 GB DDR2 333MHz (2x 2GB) Dell XPS 410 BIOS Revision 2.5.3

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• How to bring application to front every 15 minutes on Mac OS X Lion?

  - by johnnyb10

  I have a free or cheap little app called Desktop Task Timer LE that I've been using to track my time as I work on various projects. I'd like to have it pop up as the foreground app every 15 minutes to prevent me from forgetting to stop/change the timer after I've moved on to a different task. I know I can have the app launch using a script in Automator or AppleScript, but I don't know how to have that script fire off every 15 minutes. I've read about using Launchd and iCal, but I'm still not sure how to do it. (Actually, iCal is probably simple, but I'd like to avoid using it for this.) Any ideas? Also, a further feature would be to have it pop up after 5 (or x) minutes of inactivity on the computer. Not sure if this would work for my needs, but I'd like to test it if possible.

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• Change google search location beyond current country

  - by Abel

  I often work remotely and prefer using en-us locale settings for my searches. One of our computers is located in Germany, and whenever I try to change the location in Google Search Settings, I get an answer to "Pleas enter a valid Deutschland city or zip code". I checked this post, but it doesn't apply, as my language settings en-us and the Google search language is also set to English. It clearly uses the IP address of the computer. I couldn't find an answer in the Google help pages, anyone any idea how to change it London, New-York or Amsterdam?

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• How to optimize a box2d simulation in action game?

  - by nathan

  I'm working on an action game and i use box2d for physics. The game use a tiled map. I have different types of body: Static ones used for tiles Dynamic ones for player and enemies Actually i tested my game with ~150 bodies and i have a 60fps constantly on my computer but not on my mobile (android). The FPS drop as the number of body increase. After having profiled the android application, i saw that the World.step took around 8ms in CPU time to execute. Here are few things to note: Not all the world is visible on screen, i use a scrolling system Enemies are constantly moving toward the player so there is alaways to force applied to their body Enemies need to collide between each others Enemies collide with tiles I also now that i can active/desactive or sleep/awake bodies. Considering the fact that only a part of the enemies are possibly displayed on screen, is there any optimizations i can do to reduce the execution time of box2d simulation? I found a guy trying an optimization based on distance of enemies from the player (link). But i seems like he just desactives far bodies (in my case, i could desactive bodies that are not visible). But my enemies need to move even when they are not visible on screen, and applying forces will not workd on inactive bodies. Should i play with sleeping bodies here? Also, enemies are composed by two fixtures and are constantly colliding with each others and with tiles but i really never need to get notified about that. Is there anything i can do to optimize this kind of scenario? Finally, am i wrong to try to run simulation at 60FPS on mobile and should i try to make it run at 30FPS?

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• How to configure something like "Reflexive ACL" on OpenBSD?

  - by Earlz

  My U-Verse modem has something called "Reflexive ACL" described as Reflexive ACL: When IPv6 is enabled, you can enable Reflexive Access Control Lists to deny inbound IPv6 traffic unless this traffic results from returning outgoing packets (except as configured through firewall rules). This seems like a pretty good way to keep from having to maintain a firewall on each computer behind my router that gets handed an IPv6 address. It sounds about like a NAT, which for my small home network is all I want right now. Now my modem sucks as a router though, so I'm in the process of configuring an OpenBSD router to do that. I've got IPv6 supported and all that and my OpenBSD router will hand out IPv6 addresses by rtadvd. Now I want to keep people from having instant access to my local network through IPv6. How would I best do something like Reflexive ACL with pf in OpenBSD 5.0?

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