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• New EFI Laptop: After restart, Ubuntu boots to black screen?

  - by Henson S

  So, I've got this new laptop (Acer Aspire 5560 15") that's doing a funny thing.. If I cold booth the machine, everything is great! I see the grub menu, and Ubuntu 12.04 loads just fine. If I reboot within Ubuntu, I see the BIOS screen, but then nothing. No grub menu, no hard drive activity except for just a blip. I noticed that when installing Ubuntu this time, I had to create an EFI boot partition -- something I'm not used to. And I'm guessing that it has something to do with the issue. Could be totally wrong. Any ideas?

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• Ubuntu 12.04 Touchscreen Calibration

  - by Lee

  I have a machine with Ubuntu 12.04 installed, with dual monitor, via VGA and DVI Interface. The monitor is one touch screen and the other one is regular LCD Monitor. The touch screen is made in China with some unknown brand, and I am using eGalax Driver. The touch screen is now detected and works, but i need to do some calibration since it does not correctly perform click on touch. The problem is, when I’m using xinput_calibrator, it shows 4 crosses to be clicked on, because I’m using dual monitor, the crosses is now show 2 on the touch screen (touchable) and the others on the other monitor which is regular non-touch monitor. Please help, thank you.

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• Windows 8 and Ubuntu 12.10 dual boot

  - by Marty

  I have been having a tough time getting a new computer (Lenovo h430) that came with windows 8 to dual boot with ubuntu linux. I can get ubuntu to install from a usb drive and can use the live system (ubuntu 12.10) but dual booting has not worked. I have cruised the internet and tried a number of solutions such as easybcd 2.2 and boot repair under linux. I have also gone into the setup screen to try and fix it but the lenovo acromyms in the setup are not illuminating for me. Does anyone know of a clear set of instructions for installing ubuntu on a machine delivered with windows 8 ?

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• Why can't I ping server? VMware set to 'Bridged' loses IP address

  - by Dave

  I have installed a fresh 10.04 server onto a laptop on a home network as a VMware machine and set network connection to 'Bridged: connect directly to the physical network' from within VMware and rebooted the server. It then loses its IP address. dhclient eth0 says "No working leases in persistent database - sleeping" DHCP is working fine on the wi-fi router. The laptop is wired to a wireless router and from there wirelessly to a desktop. Desktop and Laptop can ping each other from Windows. I can ping the VM from Windows on the same laptop, but not from the desktop. Strangely ping has started to resolve hostnames to IPv6 addresses and not IPv4. Don't know whether that's connected? A kick in the right direction would be greatly appreciated. I've been an Ubuntu desktkop user for a few years, but new to ubuntu servers.

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• Sound works for only one user at a time

  - by Patrick

  I've noticed that sound becomes unavailable to me when someone else is logged into my machine and playing music (or has facebook open) in the other account. I've had to ask them to unlock their account and turn it off so I can get sound in my own stuff. Even in sound preferences, the hardware itself disappears and output is "dummy sound". Is there a way to prevent this from happening? What would be really good is if I could turn down the volume (or mute entirely) all the sounds on all other accounts on a per-user basis from my sound preferences without affecting whatever setting they have - essentially saying whenever user A is logged in, all sounds from user B's account are muted and anything from user C's account is at 50% while I can still have my own at full volume.

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• How to protect own software from copying [closed]

  - by Zzz

  Possible Duplicate: How do you prevent the piracy of your software? Is possible to protect some file from copying if you are administrator of machine? I heard some story about some behavior: one software developer sells his software in some way. He is installing it on every client's computer and this software does not work on other computers or cannot be copied physically. How to implement the first and second protection. Is it effectively protection if software costs about $100 for all copies across client's company?

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• How can the maximum number of simultaneous users to log in to Ubuntu server be increased?

  - by nixnotwin

  I use ubuntu server 10.04 on a fairly good machine, with 2.40 duel-core processor and 2GB RAM. My users login with ssh or samba. I have setup LDAP with PAM to sync user accounts between unix and samba. When I allowed about 90 users to login over ssh at once the server refused login for many users. I am using dropbear as ssh server. Even samba logins failed for many users. I need to allow at least 100 users to login at once. Is there anyway to do this?

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• Xen 4.1 + NVidia driver = Unity has no window decorations

  - by Shade

  I am running Ubuntu 11.10 with Unity. I installed XEN and booted its kernel. The machine booted normally. However, when I started Unity (3D), there were no window decorations. I tried Unity 2D and the window decorations are present there. I then decided to remove the driver (installed through Additional Drivers) and install it manually like this: IGNORE_XEN_PRESENCE=y CC="gcc -DNV_VMAP_4_PRESENT -DNV_SIGNAL_STRUCT_RLIM" ./NVIDIA* ...but the window decorations were still missing in Unity 3D. The window decorations are there when I boot the regular Ubuntu kernel (without XEN support). What could be the problem and how to fix it?

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• How to prevent WLAN connection from dropping permanently?

  - by Chris

  I have a desktop with a Fritz USB WLAN N stick and tried Ubuntu 12.04. Installation went fine and WLAN is working. However, connection drops permanent. Reconnecting manually fixes it but after a few minutes it drops again. It's connected to a Vodafone 802 box with WLAN N fix set. It seems that it works when I switch off N mode. But I need to test. Can someone confirm this issue or is there another solution? I have another machine with 12.04 (HP 625 laptop) running where connection is stable.

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• Anti aliasing problem

  - by byronyasgur

  I am auditioning fonts on google web fonts and one that I was discounting was Ubuntu because it looked a bit jagged ( screenshot below taken straight from google); however afterward I read an article where it was mentioned as a good choice, and there was a screenshot where it looked really good ( to me anyway ). I am using windows 7 and have tried looking at it in chrome and firefox. I notice the same thing with some other fonts but this one is a good example because it looks perfect in the screenshot but not so good when I look at it on their site. I know this essentially is a question about setting my computer, but I thought that this would be the best place to pose the question: Is there something wrong with the settings on my machine seeing as it's obviously not showing the font the same on my computer as it did when the article writer downloaded it and used it in an image. The screenshot from Google ... The screenshot from the article above ...

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• How to get the correct battery status?

  - by GUI Junkie

  At this moment, ever since I installed Ubuntu on this machine, the battery status says: not present. Looking at this answer, however, I find that /proc/acpi/battery/BAT1/info (sometimes its /proc/acpi/battery/BAT0/info, use tab complete to help) has the following info: present: yes design capacity: 4400 mAh last full capacity: 4400 mAh battery technology: rechargeable design voltage: 11100 mV design capacity warning: 300 mAh design capacity low: 132 mAh cycle count: 0 capacity granularity 1: 32 mAh capacity granularity 2: 32 mAh model number: BAT1 serial number: 11 battery type: 11 OEM info: 11 In accordance to this answer, I've checked the /proc/acpi/battery/BAT1/state file: present: yes capacity state: ok charging state: charged present rate: unknown remaining capacity: unknown present voltage: 10000 mV The acpi -b command returns: Battery 0: Unknown, 0%, rate information unavailable Any suggestions on getting the battery info updated?

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• How do I handle "Firmware file X not found" stopping bootup?

  - by John Baber

  I recently upgraded my desktop mac to Precise and now can't get past the Ubuntu 12.04 splash page. The splash freezes with [ 19.931097] b32-phy0 ERROR: Firmware file "b43/ucode16_mimo.fw" not found [ 19.9311126] b32-phy0 ERROR: You must go to http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware and download the correct firmware for this driver version. Please carefully read all instructions on this website. written on it This is when I choose 3.2.0-generic from the grub menu. If I choose to load up older kernels, I still get the same thing. How can I make my computer finish booting again? I'm able to ssh into the machine and poke around, but the actual screen freezes at the splash.

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• Solved: Chrome v18, self signed certs and &ldquo;signed using a weak signature algorithm&rdquo;

  - by David Christiansen

  So chrome has just updated itself automatically and you are now running v18 – great. Or is it… If like me, you are someone that are running sites using a self-signed SSL Certificate (i.e. when running a site on a developer machine) you may come across the following lovely message; Fear not, this is likely as a result of you following instructions you found on the apache openssl site which results in a self signed cert using the MD5 signature hashing algorithm. Using OpenSSL The simple fix is to generate a new certificate specifying to use the SHA512 signature hashing algorithm, like so; openssl req -new -x509 -sha512 -nodes -out server.crt -keyout server.key Simples! Now, you should be able to confirm the signature algorithm used is sha512 by looking at the details tab of certificate Notes If you change your certificate, be sure to reapply any private key permissions you require – such as allowing access to the application pool user.

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• Solved: Chrome v18, self signed certs and &ldquo;signed using a weak signature algorithm&rdquo;

  - by David Christiansen

  So chrome has just updated itself automatically and you are now running v18 – great. Or is it… If like me, you are someone that are running sites using a self-signed SSL Certificate (i.e. when running a site on a developer machine) you may come across the following lovely message; Fear not, this is likely as a result of you following instructions you found on the apache openssl site which results in a self signed cert using the MD5 signature hashing algorithm. The simple fix is to generate a new certificate specifying to use the SHA1 signature hashing algorithm, like so; openssl req -new -x509 -sha1 -nodes -out server.crt -keyout server.key Simples!

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• Friday Fun: E7 (Mission to Save Earth)

  - by Asian Angel

  It has been another long week at work and you should take a few minutes to relax and have some fun. In this week’s game you journey to E7 in an attempt to find and destroy the deadly bomb that is aimed at planet Earth. Can you survive the journey across the planet and complete your mission? Latest Features How-To Geek ETC Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions Super-Charge GIMP’s Image Editing Capabilities with G’MIC [Cross-Platform] Access and Manage Your Ubuntu One Account in Chrome and Iron Mouse Over YouTube Previews YouTube Videos in Chrome Watch a Machine Get Upgraded from MS-DOS to Windows 7 [Video] Bring the Whole Ubuntu Gang Home to Your Desktop with this Mascots Wallpaper Hack Apart a Highlighter to Create UV-Reactive Flowers [Science]

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• Unable to login following permission changes in device manager (11.10 + Gnome)

  - by Symanuk

  (Running Gnome 3 on Ubuntu 11.10) Everything working well (at least a couple of months), until recently when I changed the permissions through the device manager on the sda1 /2/ 3 drives, thinking it would save all the switching I seem to have to do between users in order to see / use files I previously copied across from an external drive. Now when I boot up the Ubuntu splash screen loads indefinitely, and if I go in through the GRUB / recover option, i'm getting a load of negative permission messages back (regardless of using the fsck or remount options) Either way = unusable machine (Laptop Dell Inspiron n5050), and no way through to login. I'm looking for: (1) a way back in so any help greatfully received (answers need to be pretty basic as i'm a novice), and (2) if i'm to learn anything, a decent thread on setting permissions within Ubuntu / Gnome 3. I'm new to both Ubuntu & Linux, so please be gentle!! Cheers

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• My laptop hangs a lot

  - by Salahuddin

  My laptop is 1G ram and 120G hard-disk 1.68HZ processor , I've both Ubuntu and Windows7 on my machine For the last few days, my laptop, running Ubuntu 11.10 has been hanging a lot. A lot of the time, the touchpad won't work for unknown reasons, and I have to connect a USB mouse to be able to move the pointer on the screen. When browsing the web, the browser hangs a lot, and I have to restart the laptop to refresh it. I know that there is a hotkey to force Ubuntu to refresh when it hangs, but it doesn't work here.These problems happens only on ubuntu not on windows 7... How do I make Ubuntu light and fast? Help me, please.

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• How do I install xulrunner in 12.04?

  - by chessplayer

  I am trying to migrate a virtual machine I use for my classes at the university from 10.04 to 12.04 and in that I am using xulrunner so that first, I can have SQLiteManager as a stand alone app next, KNIME can provide help for its nodes I tried adding the the mozilla ppa as described in some posts, e.g. here or here, but when I search for xulrunner in Synaptic I get no match. I read in this link, that xulrunner was left out intentionally, which, frankly, I think is a bad decision! Anyway, does anyone know a way out of this, i.e. how to get xulrunner for 12.04? Any help appreciated!

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• Turning off XON/XOFF when SSHing via PuTTY

  - by Oddthinking

  I have a fresh install of Ubuntu 9.10 on a rented dedicated server. When I ssh to it using PuTTY (on a Windows machine), I find it responds to Ctrl+S and Ctrl+Q as XON/XOFF transmission control (i.e. the terminal freezes everytime I type Ctrl+S until I type Ctrl + Q). This hasn't been a problem on other remote servers, and I realise I don't really have much idea about how this is determined. Is this something that is negotiated at the start of the terminal session, something that is set by the choice of terminal emulation (TERM=xterm, if that helps) or - as I suspect - some setting on the server I am not aware of. How do I tell Ubuntu that it is 2011, and no-one has terminals that rely on XON/XOFF any more?

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• Information about SATA, IDE (PATA) controllers

  - by Adam Matan

  I have a remote computer on which I want to install a new hard drive for rsync backup. The problem is, I don't know what controller technology is used (PATA, SATA, SATA2, ...) and how many available slots are left. I want to spare me an unnecessary drive just for opening the chassis and looking into wires. How do I query the SATA or PATA controllers? I'm interested in the following points: Which controllers exist in the machine How many (and which) disks are attached to each controller How many available slots are there

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• Ubuntu Suspend won't wake by mouse

  - by corsen

  I just installed Ubuntu 11.04 and realized that suspend would not wake by either keyboard or mouse. After following instructions from here: http://ubuntuforums.org/showthread.php?t=1642817 The system will now wake by keyboard. I have a USB mouse it is a logitech G5. Even if I enable all of the USB devices listed in /proc/acpi/wakeup, my computer will still not wake up via mouse. I'd really prefer to wake by mouse instead of keyboard due to cats. Does anyone know why my mouse won't wake the machine even after enabling all USB devices listed? Thanks, Bryan

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• "Unable to mount location. Failed to mount Windows share" error when trying to share folders

  - by paulus_almighty

  I have two Ubuntu machines both on 11.10 I want to share folders from one to the other. If, on the server machine, (in Nautilus) I right click on the folders and click Properties Share Share this folder Create share. Then on the client I'm prompted for a username and password. My username and password does not work. If I select "Guest access" check box then I get "Unable to mount location. Failed to mount Windows share" This should be straightforward, right?

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• What ports should I open for listen and/or transmit in my firewall to keep internet ok?

  - by H_7

  What are the minimum ports and services that should I allow/open for listen and/or transmit in my firewall (I am using Firestarter) to keep my internet running ok? Some talk about what services, which port uses, and why it matters should be nice too. Thanks for any advice. I have some bet to the answer 80 http 443 https 53 dns EDIT: I will just browse some sites. I have a windows virtual machine, so I ll use it too, bu t just normal navigation too. No torrents, IRC's, FLASH, etc.. Thanks for attention. hmmm... lost! Linux Mint 9 here.

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• Ubuntu partitions on Dell XPS13

  - by Francois

  I bought a Dell XPS13 with ubuntu 12.04 pre-installed. I want to reformat and repartition the machine but as I'm far from being a linux guru, I'm afraid to erase something important that could have been preinstalled by Dell. On the disk, there are 3 partitions: /dev/sda1 - Ext4 Linux bootable 248GB - witch is the system+user partition I guess, /dev/sda2 - Extended (?) of 8GB - What is this partion about? /dev/sda5 - Linux Swap of 8GB - whitch is for RAM and need to be reconduct (why only 1xRAM and not 2?) Do I have to care about /dev/sda2 ? According to you can I reformat to create a partition for /home whitout losing anything important (except user data of course) ? Thank you for your help

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• Why the overhead when allocating objects/arrays in Java?

  - by Gnijuohz

  How many bytes an array occupies in Java? Assume It's a 64bit machine and also assume there are N elements in an array, so all these elements would take up 2*N, 4*N or 8*N bytes for different types of array. And a lecture in Coursera says that it would occupy 2*N+24, 4*N+24 or 8*N+24 bytes for a N element array and the 24 bytes is called overhead, but didn't explain why the overhead is needed. Also objects have overheads, which is 16 bytes. What exactly are these overheads? What are these 24/16 bytes composed of? Also, do these overheads only exist in Java? How about C, C++ and Python?

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