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• Files and folders disappeared from my desktop

  - by Rob

  Suddenly all files, folders and icons that were on my desktop have disappeared. tried making "show hidden files", no luck. tried using recovery software, but it did not find any of this files, so I assume they were not deletes. c:/Users/<myname>/Desktop does look empty from the Explorer, as well as from cmd. installed MalwareBytes, it did find and remove some malware, but it didn't seem to help. used RogueKiller and it did find some suspicious registry called "HideDesktopIcons". ¤¤¤ Registry Entries : 4 ¤¤¤ [HJ DESK] HKCU\[...]\ClassicStartMenu : {59031A47-3F72-44A7-89C5-5595FE6B30EE} (1) -> REPLACED (0) [HJ DESK] HKCU\[...]\NewStartPanel : {59031A47-3F72-44A7-89C5-5595FE6B30EE} (1) -> REPLACED (0) [HJ DESK] HKCU\[...]\ClassicStartMenu : {20D04FE0-3AEA-1069-A2D8-08002B30309D} (1) -> REPLACED (0) [HJ DESK] HKCU\[...]\NewStartPanel : {20D04FE0-3AEA-1069-A2D8-08002B30309D} (1) -> REPLACED (0) I deleted this registry, rebooted, it only unhid My Computer and User icons, but my desktop stuff is still missing — any ideas what should I do next?

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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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• Apple Wireless (aluminium) Keyboard on Windows

  - by Dave Arkell

  I have an apple wireless keyboard which I am using with my windows pc and it works excellently, and looks superb. It all connects fine (particularly with a flashed dbt-120). However, I haven't had great success with getting all those useful keys to work with the 'fn' key. I've been using uawks as a way to get it working, but it doesn't always work. Has anyone had success with any other tools to get the fn key working (and therefore creating shortcuts to 'End', 'Home', 'Break', 'Pgup', etc? I should point out that this is not a mac computer, it is a plain old pc.

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• Can Grub be configured to remember the last OS you booted into?

  - by Matthew

  I typically have 2-3 OSes in my boot menu: Ubuntu 10.04 Windows 7 [Sometimes, a third option, such as Ubuntu 10.04 Netbook] If I am in an OS other than the default choice (Windows 7 in this case), and I reboot, Grub boots into Ubuntu 10.04. This shouldn't happen--when I reboot in Windows 7, I want to stay in Windows 7. Is there any way to configure Grub to remember my last choice, and boot into that? Alternatively, it would be even better if Grub only did this when I rebooted (not when I first turn the computer on). I realize this may not be possible, so I'd be happy with simple last-choice-remembering.

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• Another hibernation question

  - by GeekOfTheWeek

  I installed Ubuntu on my Windows 7 Sager laptop using Wubi. Hibernate (i.e. suspend to disc) is not an option from the power icon, only suspend, shutdown, etc. Hibernate is also not an option from my battery/lid close options. I understand that hibernation is disabled by default in Ubuntu 12.04. I tried running pm-hibernate but I get the following message: Looking for splash system... none s2disk: Snapshotting system and then the computer just hangs with a black screen. According to the documentation here if this fails then I can't enable hibernate but it offers no help in making pm-hibernate succeed. Could swap be my problem? It looks like I have very small swap: user@ubuntu:~$ cat /proc/swaps Filename Type Size Used Priority /host/ubuntu/disks/swap.disk file 262140 0 -1 The advice on SwapFaq is only for the author's set up (e.g. I don't have an Ubuntu install disk since I used Wubi) and he says that 'INFO: This will not work for 12.04, resume from hibernate work differently in 12.04.' Any advice? I really need to get hibernate working to use my laptop as a, er, laptop. Thanks

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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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• Startup script for Windows Recovery Environment?

  - by Recovery

  I'm trying to automate the Windows 7 Recovery Environment. I want the computer to be able to boot into the Recovery Environment, automatically run some commands, and then restart back into Windows. The reason for this is that I want to use the Recovery Environment to edit some system files that are not writable while Windows is running. (Of course, this could be done using GRUB and Linux, but it would be even better if one could use the built-in Windows Recovery Environment and avoid the need to install a separate bootloader and OS.) So far, I've found out how to tell Windows 7 to reboot into the recovery environment: reagentc /boottore shutdown /r /t 0 But once the Recovery Environment loads, it opens a dialog that requires user input to continue. Instead of that dialog, I would like to be able to specify a script to run instead. Any ideas on how to accomplish this would be appreciated. Thanks!

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• wireless dropping out

  - by Sam

  My wireless network connection is dropping out and its driving me nuts. It is weird because it happens at totally random intervals and other devices work while my computer has been dropped. Both my USB dongle and wifi card randomly disconnect from the router and I am unable to connect for a couple of minutes. It is especially irritating because two different adapters are failing at the same time, sounds like a software problem to me, but where? Both my laptop and iPod remain connected when the connection drops. What on earth is happening? I doubt its the router because the other devices would disconnect as well.

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• Outlook 2010 : "An error occurred when setting schedule permissions"

  - by francisswest

  Computer: Windows 7 x64 Enterprise. Office 2010 with Outlook 2010. Exchange account and a couple of IMAP accounts connected to the Outlook profile. Error: When attempting to share the calendar with anyone (selected from the address book) by click on "Calendar Permissions" seen here You can add or remove people without issue, except that no matter what, even if nothing is done, just opening the sharing window and closing it, you get an error message that says "An error occurred when setting schedule permissions" Verified that the issue doesnt actually effect the sharing, or the general setting of permissions. The error however is disconcerting to my user, and I would like to alleviate the problem if possible. Thanks!

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• BSOD During Windows 7 Install

  - by matheeeny

  I current have a working XP partition a Dell XPS m1330 laptop along with a working Ubuntu partition. After launching the Windows 7 install DVD from within XP I run through the options for a custom install on a free NTFS partition. Everything seemingly works as it should and then my computer restarts. After choosing to boot into the newly created Windows partition I am given the Windows 7 splash screen only to be followed by the BSOD. Here are the stop codes from the BSOD: stop: 0x0000007b (0x80D86B58,0xc0000034,0x00000000,0x0000000) Googling this tells me that it indicates an 'inaccessable boot drive'. Is it possible that its having problems booting from this partition due to the other existing partitions? I'm thinking that there may be a windows recovery CD workaround this but I am not quite proficient in its capabilities. This is what happens when I try to install by booting from the DVD

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• How can I make VNC faster?

  - by NickAldwin

  I need to remotely access and use my work computer a few times a week. I want to use VNC because of the price. I've used VNC before, mostly on my own network, where it's fast. However, VNC over the internet is incredibly slow. Even at 256 colors and lower, with Aero turned off, it is unbearably slow. I recently used Ammyy Admin to connect to do something requiring a quick reaction time. Ammyy was really fast, with almost no lag, and it was running in full color with Aero on! How can I make VNC faster, like Ammyy is? I'd use Ammyy, but I would probably run into the 15hr/month limit pretty quickly. Any suggestions? [EDIT] I'm currently using UltraVNC.

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• Random compositing lag

  - by user1020567

  My laptop specs: 512 mb of RAM, out of which 64 mb are shared with an integrated GPU - ATI Radeon Xpress 200 M. Intel 1,6 Ghz Celeron M single-core processor. I've spent months trying to figure out why compositing and effects sometimes lag on any distro I try. Now I've come to realise that no matter what drivers I try (the default ones work for me on pretty much any linux) compositing lag is random. When I used Ubuntu 10.10, for example, sometimes window compositing would lag and sometimes it wouldn't. The PC is able to render those effects so hardware is not the problem. It's completely random and unpredictable - sometimes when I turn on the computer the effects lag horribly and sometimes it's completely smooth. I've also checked startup items and there doesn't seem to be any unnecessary entries. I also tried building my own OS with Arch Linux and the problem persists there, therefore I can only assume that it's a driver issue of some sort. By default there are lots of drivers supplied with linux distributions. Could it be that they're in the way? The ones that I need are ati/radeon (or both? What's the difference between them?) and there seem to be a lot of others... What should I do?

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• How do I turn off PCI devices?

  - by ethana2

  With the purchase of an Intel SSD and 85WHr Li-ion battery and the linking of wifi and bluetooth to my laptop's wireless switch, extensive Intel PowerTop usage, switching from compiz to metacity, stopping of the desktop-couch daemon, removal of Ubuntu One and several other services from my startup, disabling of everything possible in my BIOS, and physical removal of my optical drive, I've gotten my battery life up fairly high, but I think there's still more to be done. Specifically, when I'm in class taking notes, I want to temporarily but completely power down: Ethernet Firewire USB ports SD card reader Optical drive Webcam Sound card PCMCIA slot ..without turning them off in my BIOS like they are now, if possible, because then I have to restart my computer to use any of them. As it stands, I still haven't managed to power down: Firewire USB connection to webcam sound card How do I tell Linux to disable and power down these devices? Is it true that any PCI slot can be physically powered down? My current idle power consumption is 7.9 watts plus the screen. (10.0W at min. brightness) Also, how do I set the screen timeout to ten seconds? gconf editor isn't honoring it when I set it to that. Will switching from nVidia to Nouveau save any significant amount of power?

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• Need old version Firefox Java plugin

  - by Bryan

  I need to use Java 1.6.0_20 for the software I'm running. I went to the Oracle website and downloaded jre1.6.0_20 and installed it on my computer, but can't seem to get Firefox to load Java. If I download directly from http://www.java.com/en/download/manual.jsp, the plugin works fine but is the wrong version, and I can't find on www.java.com anywhere to download any of the previous versions. According to the help (can't post link because of spam prevention), I need to go into the Java Control Panel and enable it for Mozilla. I've done this multiple times, but every time I go in to the control panel and check the box, click Apply and Save, as soon as I go back in the box is unchecked. Does anyone know either why the box is unchecked, or where I can download the old JRE that also is configured for Firefox?

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• How do I interpolate air drag with a variable time step?

  - by Valentin Krummenacher

  So I have a little game which works with small steps, however those steps vary in time, so for example I sometimes have 10 Steps/second and then I have 20 Steps/second. This changes automatically depending on how many steps the user's computer can take. To avoid inaccurate positioning of the game's player object I use y=v0*dt+g*dt^2/2 to determine my objects y-position, where dt is the time since the last step, v0 is the velocity of my object in the beginning of my step and g is the gravity. To calculate the velocity in the end of a step I use v=v0+g*dt what also gives me correct results, independent of whether I use 2 steps with a dt of for example 20ms or one step with a dt of 40ms. Now I would like to introduce air drag. For simplicity's sake I use a=k*v^2 where a is the air drag's acceleration (I am aware that it would usually result in a force, but since I assume 1kg for my object's mass the force is the same as the resulting acceleration), k is a constant (in this case I'm using 0.001) and v is the speed. Now in an infinitely small time interval a is k multiplied by the velocity in this small time interval powered by 2. The problem is that v in the next time interval would depend on the drag of the last which again depends on the v of the last interval and so on... In other words: If I use a=k*v^2 I get different results for my position/velocity when I use 2 steps of 20ms than when I use one step of 40ms. I used to have this problem for my position too, but adding +g*dt^2/2 to the formula for my position fixed the problem since it takes into account that the position depends on the velocity which changes slightly in every infinitely small time interval. Does something like that exist for air drag too? And no, I dont mean anything like Adding air drag to a golf ball trajectory equation or similar, for that kind of method only gives correct results when all my steps are the same. (I hope you can understand my intermediate english, it's not my main language so I would like to say sorry for all the silly mistakes I might have made in my question)

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• How to forward http traffic through a specific network adapter.

  - by user18129

  i have the following scenario. Two laptops are connected via a router through the Ethernet ports. These two computers need to be able to communicate together. One computer also needs to access the internet through a different adapter (i.e. we will taking these two laptops two various sites where by the most common type of internet access will be wireless).In isolation all of the various adapters work fine (i.e. the internal network works fine, and the wireless connects to the internet). However,we try to turn on all of the adapters at the same time,the following occurs: If we bridge the two network connections together on the "Server" -The internet connection doesn't work through the wireless If we don't bridge the connections The internet connections don't work It seems like http traffic is trying to be sent through the Ethernet adapter (which of course is not connected to an internet connection). How can we solve this?

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• Why is my USB data transfer so slow?

  - by Dave M G

  Whenever I do any kind of file transfer using USB, whether to a USB stick, or with my Android phone, or anything else, it is ridiculously slow. It says 59.8 KB/sec, which would be an awesome speed if this were 1991 and I was using a modem to dial up to my local BBS. Surely USB technology is better than that...? 37 seconds to move less data than the equivelent of 1 MP3 file? Also, regardless of what it says about speed and time, the reality is much, much slower. I routinely see it say something like "37 seconds left" and have to wait for minutes. Sometimes, if I want to move large amounts of files, it can say it will take 8 hours or more. Is this normal? My computer may not be the most awesome on the market, and about a year old, but it's an i5 with 4GB RAM and modern components, so surely this isn't the hardware's fault. What can I do to get better USB data transfer performance? Also, I did look at this question, but my newbie eyes don't see anything that look like an actual solution, just a lot of discussion about what transfer rates could or should be. Update: As requested in the comments, I've generated a whole bunch of output from the command line, and put it on Ubuntu Pastebin. Please see it here.

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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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• Network printer problem with 12.04

  - by G. He

  I had an HP LaserJet 3030 printer connected to an Ubuntu box. It worked fine with 11.10. I was able to print from Ubuntu as well as from Windows and Mac from the home network. About a month or so ago, I upgraded 11.10 to 12.04, then things started to falling apart. My Windows 7 laptop couldn't print to the printer any more. Today, I installed many updates on 12.04, hoping that would fix the printing problem. Unfortunately, it made the situation much worse. Now not only my Windows 7 laptop won't print, my XP desktop won't print either. Every time I print something from the Windows computer, the Ubuntu box logs an error message in /var/log/samba/log.'machineName' as: _spoolss_OpenPrinterEx: Cannot open a printer handle for printer \\server. It is interesting that it uses the server name as the printer, not the \\server\xyzprinter as the printer name. Anyone had a similar problem? Anyway to work around the problem?

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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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• When I plug an HDMI cable into my MacBook Pro with Retina Display, the resolution of the retina display changes

  - by Tyler Crompton

  I had an HDMI cable plugged in for a while that connected to a TV with no power. The retina display randomly flashed blue after a while and then changed to a different resolution (possibly 1080p). I unplugged the HDMI cable and nothing happened. So I restarted the computer to no avail. I was still having issues. So I fiddle with some settings after plugging in the HDMI cable again. Now, the retina display appears fine when no HDMI cable is plugged in, but when there is one plugged in, the resolution changes. I have mirroring turned off (which is what I want). The resolution of the retina display when an HDMI cable is plugged in is 3,360px x 2,100px (according to the size of a screenshot) and the external display is 1,600px is 900px. How can I fix the retina display to show with the correct resolution.

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• Manually forcing TCP connection to retry

  - by Vi.

  I have a TCP connection (SSH session to some computer for example) Network suddenly goes down and drops all packets (disconnected cable, out of range). TCP resends packets again and again, retrying with increasing delays. I see the problem and plug the cable back (or restore network somehow). TCP connection finally successfully resends some packet and continues. The problem is that I need to wait for a some timeout on point 5. I want to use my opened SSH session now and not wait for 5-10 seconds until it finds out that connection is working again. How to force all TCP connections to resend data without delays in GNU/Linux?

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• Network card dies when trying to wake up laptop from sleep

  - by Bugmaster

  I have a Dell XPS 1640 laptop (aka Dell Studio XPS 16), running Vista. Whenever the laptop wakes up from sleep, my Broadcomm LAN card immediately dies. Any attempt to access it completely locks up whichever program I use to access it. There appears to be no way to re-awaken the card, other than rebooting; note that Vista does not even shut down properly if some program is waiting for the card. So far, I have tried the following: Disabled the "allow your computer to shut down this device to save power" in the device properties. This had no effect. Attempted to disable and then enable the card in the device properties. No effect. Tried ipconfig /renew: this locks up ipconfig to the point where I can't even kill its process. Force-install updated drivers from broadcomm: no effect. Does anyone have any other ideas ?

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• A Disk Read Error Occured. Press CTRL+ALT+DEL to restart

  - by darroosh

  I'm new to linux world. Just downloaded ubuntu and installed it alongside with windows 7 . In grub when I choose ubuntu, it opens with no problem, but when I try to open windows 7, this message appears: A Disk Read Error Occured. Press CTRL+ALT+DEL to restart. I googled for that problem which directed me to download a boot repair tool, when I choose : advanced options / retore MBR --> apply, then restart computer , It boot to win 7 without loading the grub menu. then I opened the live ubuntu from a USB, launched the "boot repair" again, choose : recommended repair , then restart, It returns to the first problem , grub menu appear, from which I can choose only ubuntu , but win 7 show this msg again : A Disk Read Error Occured. Press CTRL+ALT+DEL to restart. I repeated more and more with the same results ... What should I do? I created a boot info summary using the "boot repair tool" if this can help , it's in this URL.

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• Is PCI Express x4 faster or slower than a standard PCI slot for graphic cards?

  - by Stephen R

  I am looking at potential motherboards for a computer I want to build and ran into this conundrum. The motherboard has two PCI Express slots that allow for 16 channel cards to fit in them. The catch is only one of them operates at 16 channels, the other operates only 4 channels. My question is, would it be faster to buy a PCI Express graphic card and install it in the 4 channel PCI Express slot? Or would it be better to buy a standard PCI graphic card and install it in one of the available PCI slots?

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