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• Screenshot Tour: 10 New Features in Android 4.2 Jelly Bean

  - by Chris Hoffman

  Android 4.2 improves on Android 4.1 in numerous ways, adding a variety of new features. Android 4.2 isn’t as big an update as Android 4.1, also called Jelly Bean, but it’s a definite improvement. If you have a Nexus 7 or Galaxy Nexus, you should be getting this update very soon. Unfortunately, it will likely take quite a bit longer for manufacturers to ship Android 4.2 on non-Nexus devices. How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary 6 Ways Windows 8 Is More Secure Than Windows 7

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• Desktop interface crashes after software updates

  - by N.C. Weber

  Recently, after installing Ubuntu software updates on the evening of December 7th, 2012, my desktop interface crashes regularly leaving me with a command line screen with a long string of automated commands showing (I assume what goes on behind the pretty desktop). At first, I thought it was only crashing whenever I played DirectX games in WINE, but now it crashes if I open the native Firefox browser or if it's doing nothing at all but sitting there. Apport attempts to report the bugs after restart, but often they crash as well. I've done a SMART check on the hard drive, and everything report OK. No read errors, no bad sectors. I am using an Acer Extensa 4620Z Memory: 2.0 GiB Processor: Intel Pentium Dual CPU T2370 @ 1.73GHz x 2 GraphicsL: Intel 965GM x86/MMX/SSE2 OS: Ubuntu 12.10 32-bit Disk: 116.0 GB with 33.4 GB Available

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• Mouse and keyboard stop working after suspend or screensaver lock

  - by LEo

  If I leave the computer and let it run into screensaver and lock the screen, the mouse left click won't go back to work. If I suspend the computer, the keyboard won't get back to work. It started after upgrading to Ubuntu 11.04. Any tips to solve this problem? The follwing lines I got on dmesg after the problem happened [30536.564415] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 [30536.565725] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 [30536.568466] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 [30536.569790] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 [30536.571123] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 [30536.571126] psmouse.c: issuing reconnect request and that after I tried to plug again my USB mouse: [31570.040088] usb 6-1: USB disconnect, address 2 [31573.490095] usb 6-1: new low speed USB device using uhci_hcd and address 3 [31573.687376] input: Microsoft Basic Optical Mouse as /devices/pci0000:00/0000:00:1d.1/usb6/6-1/6-1:1.0/input/input12 [31573.687544] generic-usb 0003:045E:0084.0002: input,hidraw0: USB HID v1.10 Mouse [Microsoft Basic Optical Mouse] on usb-0000:00:1d.1-1/input0

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• Basics of drawing in 2d with OpenGL 3 shaders

  - by davidism

  I am new to OpenGL 3 and graphics programming, and want to create some basic 2d graphics. I have the following scenario of how I might go about drawing a basic (but general) 2d rectangle. I'm not sure if this is the correct way to think about it, or, if it is, how to implement it. In my head, here's how I imagine doing it: t = make_rectangle(width, height) build general VBO, centered at 0, 0 optionally: t.set_scale(2) optionally: t.set_angle(30) t.draw_at(x, y) calculates some sort of scale/rotate/translate matrix (or matrices), passes the VBO and the matrix to a shader program Something happens to clip the world to the view visible on screen. I'm really unclear on how 4 and 5 will work. The main problem is that all the tutorials I find either: use fixed function pipeline, are for 3d, or are unclear how to do something this "simple". Can someone provide me with either a better way to think of / do this, or some concrete code detailing performing the transformations in a shader and constructing and passing the data required for this shader transformation?

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• Grub Rescue Error: Unknown Filesystem

  - by James

  I was trying to dual boot Windows with Linux (linux installed first). I read that it was easier to do so if windows was installed first. So I tried to install windows, by creating a partition for it. There wasn't enough room on the drive so I tried changing the filesystem of my existing partition to support windows. Now whenever I try to start my computer I get the grub rescue screen. I've tried booting from CD and USB with ubuntu and also with windows, but nothing happens. I ran ls in grub rescue and got hd0, (hd0,msdos5), cd (with an install disc inserted), fd0, and fd1. However if I run ls on any of these I receive the error: unknown filesystem. Can anyone help me out?

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• ati graphics always on

  - by naveen

  i use a lenovo y560 and has ubunto 12.04 and win 7 installed when i boot into ubunto i find that the ati car is always on which drains the battery and overheats the system is there any to switch off the ati graphics and use intel hd in ubuntu ati hd 5730 is the graphics card that i use and it has switchable graphics in it. in bios the only two options for video adapter is discrete and switchable after installing ati driver from amd website i am getting a commamd prompt as log in screen first error message comes as Your system is running in low-graphics mode with options to run in low graphics mode this time reconfigure exit all three options i am stuck i need to manually reboot the system

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• Ubuntu 12.04, web cam light flashing

  - by user205877

  Have been running Ubuntu on my Compaq C757 reliably since 9.10. Currently running a fresh install of 12.04 LTS. Somewhere during my regular updates, my webcam started flashing its power light. Light flashes from logon screen all throughout my session. I am not running Google Chrome but chromium and firefox. Webcam works normally whenever I run Cheese webcam booth, light comes on solid and webcam works normally. I close out of Cheese, webcam shuts off, and then the light starts blinking again. My system is dual boot, when I boot into Windows 7, webcam does not exhibit this problem. I suspect issue may be related to new laptop power management settings in kernel based on research on the web of similar problems, but I do not know how to instruct it to treat webcam differently.

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• "mountall: Disconnected from Plymouth" error in VirtualBox

  - by jonpavelich

  I installed Ubuntu (from the 11.10 Alternate CD, selecting "command-line only" mode before installing) in Virtualbox (Mac OS X Lion host) like I've done numerous times before. Installation finished without any problems, and I rebooted into my new system. Got the splash screen, it loaded, and right where it should've given me a login prompt, I got (in orange) mountall: Disconnected from Plymouth. I can just hit control + alt (option) + F1 to get the login prompt on tty1, and the system acts normally. This happens on every boot. The disk has two partitions, a 250 MB /boot partition and a 99.75 GB encrypted partition. The encrypted partition has LVM on it. One volume group, 3 volumes (swap, / (root filesystem) , and /home. At first I thought the error was from one of the LVM volumes not mounting, but they are all accessible. It isn't a critical error, but it is annoying. Any ideas?

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• Stuck on busybox after a fresh install

  - by user54841

  I installed 11.10 and was getting stuck on Busybox unless I type exit. After grabbing the latest updates it then didn't get stuck on busybox but instead on a black screen of nothingness. I've now reformatted and started again using the exit technique for the time being. I had a search here before posting and none of the answers gave much insight, other than it 'could be a gfx card driver issue'. I'm using new hardware that has no issues with Mint, Win7 or WinXp. BUT note, I'm not dual booting, its a complete fresh install formatting the entire drive. Any help is appreciated as I'd really like to get stuck into Ubuntu. Thanks in advance. -Luke

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• Wavefront mesh: determine which face a point belongs to?

  - by Mina Samy

  I have a 3D mesh Wavefront .obj file. Is there any algorithm that takes an arbitrary point coordinates as input and determines which face of the mesh that point belongs to ?? The mesh is rendered on the screen, then the user clicks on it, I want to determine which part of the mesh the user has clicked on ? Here's the code using LibGDX: Vector3 intersection=new Vector3(); Ray ray=camera.getPickRay(x, y); //vertices is an array that hold the coordinates of the mesh boolean ok=Intersector.intersectRayTriangles(ray, vertices, intersection); Thanks

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• Render 3d object to 2d surface (embedded system)

  - by Martin Berger

  i am working on an embedded system of a sort, and in some free time i would like to test its drawing capabilities. System in question is ARM Cortex M3 microcontroller attached to EasyMX Stellaris board. And i have a small 320x240 TFT screen :) Now, i have some free time each day and i want to create rotating cube. Micro C PRO for ARM doesnt have 3d drawing capabilities, which means it must be done in software. From the book Introduction to 3D Game Programming with DirectX 10 i know matrix algebra for transformations but that is cool when you have DirectX to set camera right. I gues i could make 2d object to rotate, but how would i go with 3d one? Any ideas and examples are welcome. Although i would prefer advices. I'd like to understand this.

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• Cinnamon Settings blank after update

  - by Seth Balmore

  Using Ubuntu 12.04 with the cinnamon desktop, I installed the most recent updates and now when I open "System Settings" the entire window appears as a blank white screen. The headers for APPEARANCE, PREFERENCES, and HARDWARE are present, but the usual icons for *Background, *Hot Corners, *Printers, etc. are no longer visible. Some of these settings can still be altered via the terminal: cinnamon-settings backgrounds cinnamon-settings applets cinnamon-settings mouse and touchpad But other commands, such as cinnamon-settings hot corners are met with an error. This is obviously a problem with cinnamon, so I just want to bring it to attention and find out when they plan on fixing the bug. A workaround can be found on the web, but it seems way to risky to rely on.

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• Sound notification over SSH

  - by Lekensteyn

  I just switched from the Konversation IRC client to the terminal based IRSSI. I'm starting IRSSI on a remote machine using GNU screen + SSH. I do not get any sound notification on new messages, which means that I've to check out IRSSI once in a while for new messages. That's not really productive, so I'm looking for an application / script that plays a sound (preferably /usr/share/sounds/KDE-Im-Irc-Event.ogg and not the annoying beep) on my machine if there is any activity. It would be great if I can disable the notification for certain channels. Or, if that's not possible, some sort of notification via libnotify, thus making it available to GNOME and KDE.

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• Why does Live-USB boot freeze at the moving dots?

  - by Caleb

  I am currently trying to boot into Ubuntu 12.04 x86 using a USB. I used Untetbootin to do all that boot crap and what not. But for some reason Ubuntu wont load pass that screen with the dots and the purple background. What happens is the dots all light up once, then they go back to white then they all light up at the same time and then it just gets stuck there. Ive even tried using an x64 copy (since my CPU supports it) but have no luck with that either. Ive even tried different DISTRIBUTIONS of Linux and all have failed with loading. Please help

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• Any way to set up a grid for a board game in cocos 2d?

  - by Scott

  My first idea was to create a 2d array for my columns and rows, but it seems like there should be a better, or possibly cleaner, way to achieve this. Each square on the grid is going to have a background image, probably a .png although I might just draw the images with a draw method. Basically, I want to be able to drag and drop images onto the individual grid squares. I've been searching for a solution and the closest thing I can find is the tiled map solution. That just seems like a little overkill for what I'm trying to accomplish. Also, I don't know if this helps but i need my grid to be 12 by 12 and take up the entire width of the iphone screen.

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• How do I show a minimap in a 3D world?

  - by Bubblewrap

  Got a really typical use-case here. I have large map made up of hexagons and at any given time only a small section of the map is visible. To provide an overview of the complete map, I want to show a small 2D representation of the map in a corner of the screen. What is the recommended approach for this in libgdx? Keep in mind the minimap must be updated when the currently visible section changes and when the map is updated. I've found SpriteBatch(info here), but the warning label on it made me think twice: A SpriteBatch is a pretty heavy object so you should only ever have one in your program. I'm not sure I'm supposed to use the one SpriteBatch that I can have on the minimap, and I'm also not sure how to interpret "heavy" in this context. Another thing to possibly keep in mind is that the minimap will probably be part of a larger UI, is there any way to integrate these two?

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• Ubuntu 12.10 Unity Dash transparency problem

  - by madox2

  I have just upgraded my Ubuntu 12.04 to 12.10 and there is following problem. When I press super button to show Unity Dash I get wrong background image behind the dash box. Especially I can see part of the bottom of the screen. Also when I set transparency to top panel the background behind is not correct. Here is an example with Mc Duck picture: Unity Mc Duck example Do you have any ideas whats wrong? My system preferences: Ubuntu 12.10 32-bit Intel® Pentium(R) CPU G840 @ 2.80GHz × 2 GeForce GTS 450/PCIe/SSE2 Any help will be highly appreciated!

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• Can I use Ubuntu as a wireless media server which performs all decoding/processing server-side?

  - by AthloX

  I want to setup UBUNTU 12.04 desktop as Home media server. I have window 7 netbook and UBUNTU 12.04lts laptop even a samsun galaxy note tablet (android). Two desktop in other room with dualboot win7 and ubuntu. SHARP AQUOS Plasma Tv with Wi-Fi connected. I want to install ubuntu as media server to stream audio/video files over wi-fi. Not only this i want this media server to use its own processing power to decode ans stream so that on remote end only file can play without using their own resource. Is it possible to use ubuntu as media server to stream files without making the remote end to use there own resource. I want only bandwidth of Wi-Fi to be use in this and media center hardware resource.Remote end gadget should use only speaker and screen and not processing power of their own. Please any suggestion is it possible to do so ?

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• Brightness controls doesn't work on a MacBook Pro 5.5

  - by Jeff Labonte

  I recently installed Ubuntu on my MacBook pro 5.5 (mid 2009). I have a problem with the brightness control. The thing is, when I try to reduce the brightness of my display which would help my battery life dramaticlly is doesnt work. I tried to use the system preference but no succes. I tried to look of it changes something if disconnect the computer from the charge I the screen will dimm but once against I failed. I tried many things such as pommed or Many other little things that I have had read on forums.

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• How do I find the angle required to point to another object?

  - by Ginamin

  I am making an air combat game, where you can fly a ship in a 3D space. There is an opponent that flies around as well. When the opponent is not on screen, I want to display an arrow pointing in the direction the user should turn, as such: So, I took the camera location and the oppenent location and did this: double newDirection = atan2(activeCamera.location.y-ship_wrap.location.y, activeCamera.location.x-ship_wrap.location.x); After which, I get the position on the circumferance of a circle which surrounds my crosshairs, like such: trackingArrow.position = point((60*sin(angle)+240),60*cos(angle)+160); It all works fine, except it's the wrong angle! I assume my calculation for the new direction is incorrect. Can anyone help?

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• How to create Windows XP LiveUSB using Ubuntu to replace it

  - by Orion Clark

  I am using an Acer Aspire One netbook with no CD-disk drive, and would like to uninstall Ubuntu 12.04 LTS and install Windows XP in its place. The problem here is that I can't seem to find a program that can put the windows boot files on a USB drive from an ISO file. I have Ubuntu fully installed and have tried using unetbootin. When I tried booting from unetbootin I got a screen with a blue box that had the word "default" in it highlighted. underneath the box there was a countdown that said "will boot from default in 10" after the countdown finished the number would revert to ten and nothing would happen. Can someone tell me another program that would be useful for this please?

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• How to take screenshot while a menu is open [closed]

  - by Anwar

  Possible Duplicate: How to take a screenshot of a whole desktop with app menu selection? I recently wanted to take a screen shot of a nautilus menu to provide an image to the answer of a nautilus related question. (I was looking for it). But when I opened up the menu and press the prtsrc key, nothing happened. I have also tried Shift+PrtSrc Key and Alt+PrtScr key. Result was the same. My question is : Is is not possible not take a screenshot while you have a menu open?. Is it bug or not? Note: To test this, just right-click on the desktop, and press prtsrc key.

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• How to do fluid dynamics like “Where's My Water”?

  - by Edgar Miranda

  There is a game on the app store called "Where's My Water" that is really fun and uses fluid dynamics in its gameplay. You can check out a video of the gameplay... You use your finger to remove dirt from the screen, and then the water just flows to the new area. Anyone knows what engine this was made in and how they where able to get the fluid dynamics in there? I'm using the Corona SDK for mobile development and want to do something similar like this (a game with fluid dynamics).

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• Problem installing LibreOffice; please help!

  - by EmmyS

  I followed the instructions for installing LibreOffice found here, which are basically the same instructions found all over askubuntu and the web in general. I followed the instructions (including removing OO first) for gnome; all that is in my Applications menu now is LibreOffice (OO used to have OpenOffice Spreadsheet, OpenOffice Presentation, etc.) When I open LibreOffice, I get the splash screen/menu, but all of the choices for creating new docs are greyed out. It also will not open any office/type files (no errors; they just don't open.) The terminal commands indicated that installation was successful, but obviously something is missing. I'm guessing I can just reinstall OO from the software center, but I'd really like to give LibreOffice a try, given the lack of ongoing development on OO. Can anyone help me out?

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• Ubuntu 12.04 - after update it boots in command line only (no windows manager)

  - by ZSW

  I have Ubuntu 12.04, which has been working great for me since I installed it a year ago. Yesterday I ran the updates that update manager recommended. (Last time I ran updates before was about a week ago). After the updates were installed, it asked me to reboot. So I rebooted it, and then it stopped at login prompt (as a command line, with no windows). I logged in and tried to manually start the windows manager, and the screen went blank, and stayed blank I waited several minutes, and then turned it off. How can I figure out what is the problem? Which logs should I check?

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