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• Systems Not Booting after Ubuntu installation

  - by moros

  I recently installed Ubuntu on my PC dual-booted with Windows 7. After rebooting it went through the usual startup screens, but the OS selection screen never shows up. I cannot get either system to boot. I have formatted the partition holding the Ubuntu to no avail and I really don't want to get rid of Windows. I am currently stuck using the Live session disk to boot. Any help is greatly appreciated.

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• Error when restarting computer after successful Ubuntu 12.10 installation

  - by Amy

  I was having a lot of sudden issues with my computer (slow on start up progressing quickly to not being able to start ...even in safe mode). Worked on several different things. Finally tried formatting hd and then installing Windows 7. Got errors so I said screw it and tried Ubuntu. Downloaded it (via my laptop), burned on DVD, and tried a disc boot on my desktop. Went through the whole installation, said it was successful and progressed to the restart. It stopped at a screen with an error (0x1b5a6) from 'hd0' I don't remember the error code verbatim. Now when I try restarting it I get to the initial page, hit 'enter' on Ubuntu..and it just sits at a blank screen. Eventually it runs through this screen with a bunch of code and then just sits there. I can't type anything and enter does nothing. Some things on the screen are: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block (0,0) I don't know what else to do... Restarting does not work. I have been working on fixing my computer for almost 2 days straight...

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• Can't boot Windows Xp after intalling Ubuntu 12.04

  - by Omul Neted

  Here's the situation. I installed Ubuntu using the along side option. Everything went ok. When I restarted I went strait to Ubuntu and it worked beautifully. When I restarted and tried to enter windows, the loading screen appeared, and after 3 -4 seconds it restarted again. No error, no cursor waiting, no nothing. I looked on the internet for help and found several resources. I tried first lilo since it seemes that many people had they're issues solved with it. After lilo neither ubuntu nor Windows would start. I installed and used bootinfoscript. The RESULTS.txt can be seen below https://www.dropbox.com/sh/r3luoa672qe73uq/Mob13HhNiB After that I looked at Boot-Repair I did as instructed here Can't boot XP after Ubuntu Installation, how to fix? ,meaning I redid the mbr of my Ubuntu install using a generic mbr. with no success. The results of boot-repair are in the first link. Now when I restart my computer I don't even get the windows loading screen, just Missing operating system Missing operation system Operating system not found that's it. I did not use the fixboot or fixmbr option because I don't have a windows cd cabable of seeing my hdd drivers. The usual XP windows setup tells me that I have no hdd. Please help, I don't know what to to next. This is my first time with Ubuntu or any Linux OS.

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• Missing Operating System after trying to upgrade to Ubuntu 11

  - by Mauricio

  there! After trying to upgrade from Ubuntu 10.04 to 11, the upgrading process stopped when running and then I got an "out of disk, grub rescue" message when booting. After running Boot Repair, I got this results. Now I get "Missing Operating System" whent trying to boot. Bellow I show some results from some commands I gather from help foruns, but I still reached no solution. Could you please help me? Any enlightment will be very helpful! Disk Utility says "Disk has a few bad sectors". When trying to run the Self-test I get "FAILED (Read)" Here we have what Gparted says about the /dev/sda1 partition (ext4): Flags: boot Status: not mounted Warning: e2label: Attempt to read block from filesystem resulted in short read while trying to open /dev/sda1Couldn`t find valid filesystem superblockUnable to read the contents of this filesystem! From sudo fdisk -lI got: Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000e0596 Device Boot Start End Blocks Id System/dev/sda1 * 2048 607428607 303713280 83 Linux/dev/sda2 607430654 625141759 8855553 5 Extended/dev/sda5 607430656 625141759 8855552 82 Linux swap / SolarisDisk /dev/sdb: 320.1 GB, 320072933376 bytes255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000c3c41 Device Boot Start End Blocks Id System /dev/sdb1 * 63 625137344 312568641 c W95 FAT32 (LBA) " and fromsudo fdisk /dev/sda1I got fdisk: unable to read /dev/sda1: Inappropriate ioctl for device` From sudo mount /dev/sda1 /mntI got: mount: wrong fs type, bad option, bad superblock on /dev/sda1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so From sudo update-grubI got: error: cannot read from `/dev/sda'. /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).

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• Won't boot after installing Ubuntu 12.04 sucessfully

  - by Matt

  I installed 12.04 successfully and rebooted (I took out my installation CD), and selected the newly installed Linux partition to boot from rEFIt. Then it just comes up with this error message: Error loading operating system which could not be more vague. Take that back. I guess it could say just "error." I don't even get to the boot prompt which limits what I can do. I cannot boot into rescue mode. I tried boot-repair, but it took more than 24 hours to check the system configuration, so I gave up on that. I'm running a Mac Mini with its main OS being Mac OS X 10.5.8. I have an alternate OS Windows XP installed, which was virtually destroyed by this Linux installation. I sacrificed my working, speedy Windows partition for something that won't even boot up. What was I thinking. My Mac partition is slow as crap. I've tried installing 12.04 many times with two different disks. The first time, I had one partition for Linux, then I had 2 (swap+main), then 3 (swap, main and BIOS), then 4 which is what I have now (swap, main, BIOS, and boot/grub). The only way I could get through the install without GRUB giving up was if I created a separate partition for it. Which was pointless, because it did install successfully, but it still doesn't boot up at all. Could rEFIt be booting off of the BIOS or one of the other partitions? Because if that's the case, there is no alternative, because Mac itself without rEFIt refuses to recognize a Linux ext4 (or 2 or 3) format partition. Apple always has to make everything so difficult. If I'm not mistaken, rEFIt is the only application of its kind for Mac. I can boot off of the CD back to the install/try screen. This is extremely upsetting, can you guys help? Please?

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• USB3 boot device disappears post-grub

  - by JoBu1324

  I have an installation of Ubuntu 12.10 on a USB3 device, and it occasionally disappears during boot, dropping me into busybox. This is what I've been able to figure out so far: During a single boot, the following happened: At the grub2 menu, I typed c and dropped to the grub> prompt I typed ls -l and got a list of all the devices, including partitions and UUIDs - the USB3 partitions were available I escaped back to the boot select menu, selected the default item (ubuntu) and hit enter The screen went black for a second before turning into the purple Ubuntu boot screen with the dots (which usually indicates that the boot will fail. When all is well I don't get the black screen) The boot dropped into BusyBox v1.19.3 with the message `ALERT! /dev/disk/by-uuid/[uuid] does not exist blkid displays all of the partitions except those of the USB3 device, as does ls /dev/disk/by-uuid or any of the alternatives.

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• Formatted Ubuntu partition & now grub says "error: no such partition" - can't enter windows

  - by qwBJ

  I had installed Ubuntu (current version: 11.xx) alongside Windows Vista. Now I formatted the Ubuntu partition & merged it with another partition (without thinking, obviously). Now, when I restart the computer, GRUB probably tries to find the old partition (which does no longer exist) and says: error: no such partition. grub rescue> Now I dont know what to do (I'm a total beginner). I tried to re-install Ubuntu on the newly formatted partition but this won't work, because after removing the install-usb (which I am said to do during installation) I find the above error-message again. I guess I need some way to reconfigure grub OR to reinstall grub/ubuntu (on the newly formatted partition) OR to reinstall the windows boot manager (without reinstall. Windows), but I have no idea how to do either of these things.

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• Error "fixing recursive fault but reboot is needed"

  - by Gordon

  I am trying to install ubuntu for the first time. (long time windows user, first time linux!) Version = 11.04 Hardware = Acer Travelmate 4050 I can boot from USB or CD and it loads fine I have installed and reinstalled several times from both USB and CD and it completes correctly However, when I boot from the HDD I get the above error I don't see any errors like "kernel panic" mentioned elsewhere It happens whether I boot with AC adapter in or out and also with adapter in but battery out Not sure how to get further info to help with diagnosis Suggestions?

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• I Installed Ubuntu 12.04 on a dell Inspiron 1501 along side windows vista using the windows installer but it wont boot into Ubuntu

  - by Nicholas

  I Installed Ubuntu 12.04 on a dell Inspiron 1501 with an AMD 64 along side windows vista using the windows installer but it wont boot into Ubuntu. It shows that Ubuntu is on the system when my computer boots up but when I select it to load it goes into a black screen and displays some error messages and tells me that the is no operating system installed. this is the error that i get: Try (hdo, 0):FAT16:no WUBILDR try (hdo, 1)NTFS: error: "Prefix" is not set. symbol not found:'grub_file_get_device_name' Aborted. Broadcom UNDI PXE-2.1 V2-1.0 copyright (c) 2000-2006 Broadcom corporation copyright (c) 1997-2000 Intel corporation All rights reserved PXE-EC8:PXE structure was not found in UNDI driver code segment. PXE-M0F Broadcom PXE Rom Operating system not found How can I fix this? I have tryed re-installing it but i get the same error.

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• Ubuntu 12.10 stopped during booting

  - by Alberto

  Good morning, I'm very new to Ubuntu. I decided to change to Ububtu (12.10) for my old laptop (Compaq Presario R3000 with AMD Athlon XP 2800+) that previously used Windows XP. After the installation, the PC restarted but, after a certain activity of the HDD stopped. Menwhile, no information from the screen (blank). Then I retried in recovery mode and the activity stopped at a certain point. I write the last two lines: [ 11.020922] pcmcia_socket pcmcia_socket0: cs: IO port probe 0x3000-0x7fff: [ 11.021676] excluding 0x3000-0x30ff 0x3400-0x34ff 0x3800-0x38ff 0x3c00-0x3cff I don't know how to solve the problem. Thanks in advance for the help.

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• Unable to boot post upgade to 12.10 from 12.04 on a dial boot PC

  - by Prateek

  I have a dual boot PC with Win7 and Ubuntu. Last night I upgraded from 12.04 to 12.10 and since then I have not been able to boot and PC goes into grub rescue with error "File not found" I have tried the below steps set prefix=(hd0,msdos5)/boot/grub/i386-pc/ set root=(hd0,msdos5) insmod normal ( i get error symbol not found : 'grub_disk_dev_list'. when I try linux /boot/vmlinuz-3.2.0-32-generic root=/dev/sda5 ro (i get error - command not found 'linux' ) same for initrd I am not able to find out what sdXX to set also.

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• ubuntu server 12.04 new installation does not boot

  - by itsols

  I've just installed server 12.04 on a new machine. It's got two network cards and two hard drives. During installation it asked me if I wanted to make it RAID and I said ok to that. Finally, it came to the packages options and I chose things like Samba, LAMP, etc. And then it asked to reboot without the CD. Did that and that's where the problem started. Nothing comes on the screen. Only a blinking cursor. Has anyone experienced this problem? I'm guessing that it may be a RAID issue. Not sure. Any thoughts please...

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• Ubuntu 12.04 won't load - hangs at Busybox v1.18.5 / initramfs

  - by Marty

  I want to start by saying that I am very new with Linux (about 1 month using it). I have had no problems up until now. I am running Ubuntu 12.04 from a Toshiba laptop with 250 GB hard drive and 3 GB of ram. Everything worked fine yesterday. The only changes I made was was that I downloaded Banshee to try as a replacement for Rhythmbox and did a few recommended updates. This morning I tried to boot and it took a long time and I finally got this error: mount: mounting /dev/disk/by-uuid/02bc41cc-1e21-4700-a179-be2805a658c4 on /root failed: Invalid argument mount: mounting /dev on /root/dev failed: No such file or directory mount: mounting /sys on /root/sys failed: No such file or directory mount: mounting /proc on /root/proc failed: No such file or directory Target filesystem doesn't have requested /sbin/init. No init found. Try passing init= bootarg. BusyBox v1.18. (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash) Enter 'help' for a list of built-in commands (initramfs) I'm not sure what to do beyond this point. I have read around on here and haven't found the help I need. I did try to boot it from the Live CD. I can boot up to the Try Ubuntu/Install Ubuntu screen. When I go through the Try Ubuntu selection I can't access my hard disk. When I clicked on it I got this error: Unable to mount 247 GB Filesystem Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sda/1, missing codepage or helper program, or other error. In some cases useful info is found in syslog - try dmesg|tail or so. I tried dmesg|tail and saw a string of values but nothing that looked helpful. I have also tried to boot from the GRUB screen as recovery mode and previous Linux version but they didn't work either. I tried to load Windows Recovery Environment (loader) (on /dev/sdc3) and got this message: error: no such device: 268057B1805785E9 error: hd1 cannot get C/H/S values I had saw somewhere that I could fix this with the Live CD but my knowledge isn't good enough to try. I tried something with Gpart that I had read, but the system told me that I didn't have Gpart. Could someone please explain to me what I need to do and/or haven't tried yet. Thanks so much!

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• 12.04 boots into terminal after first install. How to boot into GUI permanently?

  - by Deniz

  As a person with a quite limited CLI experience I congratulate myself on installing Ubuntu on an ancient non-pae Fujitsu Amilo M1425 thru the network with mini.iso. However upon reboot I'm met w/ the following: Ubuntu 12.04.1 LTS ubuntu-fujitsu tty1 ubuntu-fujitsu login: for which my specified login during setup is not accepted. (I'm quite sure its correct) Let's assume this screen is passed, how to start the GUI and make it the permanent option during boot? This box will return to a mostly comp-illiterate person, for which the existence of ubuntu will be an enough shock already. Wouldn't wanna leave him w/o the GUI. Other posts here mention the command startx but I probably need a login in the first place.. So "why won't it accept my login & how can I make the GUI-boot permanent?" is my question. Thanks in advance.

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• Doesn't boot after installation

  - by jchysk

  Downloaded Ubuntu 12.04.1-alternate-amd64 Installed to USB stick Integrity check fails on ./install/netboot/ubuntu-installer/amd64/pxelinux.cfg/default but that seems to be a known bug where the file isn't included in the alternative 64-bit ISO and shouldn't affect installation. I ignore it and proceed on. For partitioning on 2 SSD Drives: Partition 300MB and 63GB on both RAID1 the 300MB and 63GBs Set the 300MB to EXT4 on /boot Encrypt the rest as MD1 and set it for LVM Create two volumes from MD1: 4GB swap and 59GB to / I go through the installation and get to the point where it says everything is ready and to take the media out so as to boot from the drives I receive the error "Error: No video mode activated." on startup I've read that this can be solved by running "cp /usr/share/grub/*.pf2 /boot/grub" and then updating grub but I can't get to a place where I can actually run this command. In rescue mode I can get to a shell from installer with /boot mounted to /target. So from there I can run "cp /cdrom/boot/grub/font.pf2 /target/grub/" but can't figure out a way to get it to update grub after that or know how what to change in manually updating the grub.cfg file. If I try other devices to mount the root filesystem I get the error "An error occurred while mounting the device you entered for your root file system". It just sits on the video mode error and doesn't progress further. Googling around it seems like people see the error briefly before it continues booting, not getting stuck on it the way I am which leads me to believe that error may be unrelated to Ubuntu not booting. So any ideas as to what I should try next or what needs to be done to install Ubuntu and get it to boot would be helpful.

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• boot up fails. drops to initramfs prompt 12.04

  - by dpm

  I am running an HP pavilion dv6000 dual boot win7 and Ubuntu 12.04. (well, up until today). after a reboot, the boot process drops to the busy box shell and i end up at the prompt: BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) Ive been researching others who have had this same problem, but haven't been able to find any of those solutions to work for me. I tried the method described here: http://www.proposedsolution.com/solutions/ubuntu-booting-to-initramfs-prompt/ and after the final command mount -t ntfs-3g /dev/sda1 /root -o force it does nothing and gives me another (initramfs) prompt. I can boot to a live CD (USB) and get to a terminal, but it doesn't seem to do much good, as I can see the /dev/sda1 in the ls command, but it doesn't recognize it when I try to cd to it. My command line skills are very green, and am just starting to grasp them. One more question: using the command fdisk -l how can I tell which mount point (sda1/sda2) is my windows partition and which one is Ubuntu? Any help? I'm in a bit over my head right now...

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• Can't boot in Ubuntu after windows upgrade

  - by VanceAnce

  After my lastest update for Ubuntu and Windows XP, I got a Grub error on booting the next day. ls lists the following (without () ): sd0 sd1, msdos sd2 sd5 sd6 When I tried to get into one with (sd0,xy)/ it doesn't detect system or unknown file system error. I tried to boot to a live session with a Knoppix live CD and found out that all data exists. I also tried to recover with TestDisk and it finds all systems. Here is the test disk result: Start End Size in sectors 1 * HPFS - NTFS 0 1 1 7079 254 63 113740137 2 E extended LBA 7080 0 1 12161 254 63 81642330 5 L HPFS - NTFS 7080 1 1 10266 254 63 51199092 [Schule] X extended 12031 30 1 12161 254 63 2102625 6 L Linux Swap 12031 31 33 12161 254 63 2102530 I've 1 winxp-home, 1x Ubuntu (ext3+swap) and 1 winxp prof and then I wrote on mbr with TestDisk but I always get the same errors with Grub. What should I do? I need both XP and Ubuntu. Help me please. more infos in answers below - sry for thos confusing style but im working on diff live system and browsers and have to reboot always the boot info script output is also down below maybe an advanced user can correct my fail posting - after i can solve my issuse i will register here thanx and pls help me with those weired issues ! as i still cant just comment my own answer or those on top i again has to put it here as a sepperate answer..... (or even edit - maybe an browser failur using the live cds ... cause this posti can edit) here the bootinfo script output - but the result is the same as with TestDisk ... but it looks worse - cause it also doesnt detect my old ubuntu ... but there wasnt a eares process or overwrite process visibile ending the last working session output: Boot Info Script 0.61 [1 April 2012] ============================= Boot Info Summary: =============================== = Syslinux MBR (4.04 and higher) is installed in the MBR of /dev/sda. sda1: __________________________________________ File system: ntfs Boot sector type: Windows XP: NTFS Boot sector info: No errors found in the Boot Parameter Block. Operating System: Windows XP Boot files: /boot.ini /ntldr /NTDETECT.COM sda2: __________________________________________ File system: Extended Partition Boot sector type: - Boot sector info: sda5: __________________________________________ File system: ntfs Boot sector type: Windows XP: NTFS Boot sector info: According to the info in the boot sector, sda5 starts at sector 63. Operating System: Windows XP Boot files: sda6: __________________________________________ File system: swap Boot sector type: - Boot sector info: ============================ Drive/Partition Info: ============================= Drive: sda _______________________________________ Disk /dev/sda: 100.0 GB, 100030242816 bytes 255 heads, 63 sectors/track, 12161 cylinders, total 195371568 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes Partition Boot Start Sector End Sector # of Sectors Id System /dev/sda1 * 63 113,740,199 113,740,137 7 NTFS / exFAT / HPFS /dev/sda2 113,740,200 195,382,529 81,642,330 f W95 Extended (LBA) /dev/sda5 113,740,263 164,939,354 51,199,092 7 NTFS / exFAT / HPFS /dev/sda6 193,280,000 195,382,529 2,102,530 82 Linux swap / Solaris /dev/sda2 ends after the last sector of /dev/sda /dev/sda6 ends after the last sector of /dev/sda "blkid" output: ____________________________________ Device UUID TYPE LABEL /dev/loop0 squashfs /dev/sda1 6596D86768011128 ntfs /dev/sda5 1300D3B7744EC141 ntfs Schule /dev/sda6 5b95f2a1-4145-43a5-ac51-41d7dd32b213 swap ================================ Mount points: ================================= Device Mount_Point Type Options /dev/loop0 /rofs squashfs (ro,noatime) /dev/sr0 /cdrom iso9660 (ro,noatime) ================================ sda1/boot.ini: ================================ [boot loader] timeout=30 default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS [operating systems] multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Home Edition" /fastdetect /NoExecute=OptOut multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Microsoft Windows XP Professional" /fastdetect [spybotsd] timeout.old=30 the last part shows that i now use the windows boot loader so that i can acces at least one OS but shouldnt i also get acces to my ubuntu partitions with live-linux-cds ? or do i have to boot with grub to get to those files only ??

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• Can I prevent an IDENTIFY PACKET DEVICE command to a specific device at boot?

  - by Brian Spisak

  This is related to a previous question related to installation that is now resolved. I'm opening a new question, because I still need to get my DVD drive working. Problem: Failed boot when my ASUS DRW-24B1/ST DVD drive is attached to my asmedia ASM1061. Symptom: ata8.00: exception Emask 0x52 Sact 0x0 SErr 0xffffffff action 0xe frozen ata8: SError: { blah blah } ata8.00: failed command: IDENTIFY PACKET DEVICE ata8.00: cmd blah blah res blah blah (ATA bus error) ata8.00: status: { DRDY } ata8: hard resetting link Background: The ASM1061 is a PCIe to SATA bridge providing 2 x 6Gb/s ports and is supposed to be fully compliant to SATA specs. I just discovered in the fine print of my ASUS P8Z77-V pro motherboard that "These SATA ports are for data hard drivers only. ATAPI devices are not supported." However, I have already installed Windows 7 using this drive and I can run the Ubuntu 12.04 installer from it as well. The only time I have a problem is during Ubuntu boot when it tries an IDENTIFY PACKET DEVICE which seems to be an ATAPI command. I can't simply switch this device to another SATA port because they are already allocated to other devices. (My chipset's 2 x 6Gb/s are connected to my boot SSD and a fast HDD while the 4 x 3Gb/s ports are running a RAID 5 array.) If this can't be fixed or worked around, I suppose I'll have to go buy SATA add-in card. Blech. Thoughts: If indeed this is a device specific issue (that it doesn't support ATAPI discovery) then I can't expect - is it udev? - to work with it. But, it seems that Windows and even the Ubuntu installer work just fine. So why does udev have a problem? At the end of the day, it would be nice to have the DVD working under Ubuntu, but I can live without it. But, as this is a dual-boot machine, I can't physically disconnect it because I want it to work with Windows. (And physically disconnecting it every time I want to boot Ubuntu is NOT an option. ;-) Questions: Should this be considered a bug? My feelings are that if it works with other OS that it should probably work with Ubuntu as well. How can I work around this problem? I have a limited knowledge of linux internals, but it seems I should be able to somehow tell udev (or whatever is doing the discovery) to ignore that device. Is there a way?

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• Unknown filesystem error

  - by Ben

  My computer has (had) a dual boot of Ubuntu Precise and Windows 7. Recently, when I started the computer, grub gave me an error saying "Unknown filesystem", and sent me to grub rescue. I searched for solutions to this, and found this answer: Unknown filesystem error: grub rescue. I followed the instructions there, but they didn't really help: when I restarted the computer, it went straight to Windows without grub intervening at all (so it boots successfully, just not to the OS I want). This is the log from boot-repair. My Ubuntu partition is sda6. Naturally, I'm a little worried, since the log says "unknown filesystem type ''", which to me looks like the partition might be corrupt somehow. From the Ubuntu Live CD, I started gparted and looked at my partitions, and it also told me that my sda6 is an unknown filesystem. So my questions are basically: Can I restore Ubuntu to the way it was? If not, can I at least rescue the data I had on the partition somehow? Again, if I can't restore Ubuntu, how do I clean everything up so that I can reinstall it without too many complications? Another thing I should mention is that yesterday I had a similar problem where the computer told me there was a problem with the hard drive when it was starting, but it fixed itself by running fsck (that time it got past grub, and managed to start Ubuntu). Between that occasion and me having trouble booting the computer today, I have booted it successfully at least twice. Thanks for any help!

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• How to reset settings when Unity won't finish booting?

  - by Emre

  I have a new 12.04 installation and I messed things up after trying to move /home to an NTFS partition, which I later learned was a bad idea. I removed references to the NTFS partition on fstab and created new users on the ext4 / partition. Now I can't get Unity to start up properly for any user. I get the GUI with only three Launch icons (none of which are clickable) and no bar at the top. The keyboard seems to the nonfunctional after I enter my credentials. The interesting thing is that I can boot when I go through recovery mode and select resume. I wonder whether I am creating the new users properly. What is the correct protocol for doing so in order to ensure that they can run Unity?

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• Can not mount /dev/loop0 (/cdrom/casper/filesystem.squashfs)

  - by simpleton

  I downloaded 12.04.1 and md5 sum checked them and everything is good. Made a live usb and booted up... Just gets to where its about to start with the purple ubuntu loading screen then it goes back to text and gives this message: BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) mount: mounting /dev/loop0 on ///filesystem.squashfs failed: Input/output error Can not mount /dev/loop0 (/cdrom/casper/filesystem.squashfs) on //filesystem.squashfs This happens in the live option, or persistent even the file checking one doesn't work Also I've tried a few different F6 options to no avail. I used 'LiLi USB creator' and 'unetbootin' and also 'Universal USB Installer,' all with the same results. I've also tried using a VM and it showed the same. That is when I figured I had a corrupt .iso so I downloaded it again checked the MD5: e235b63c02644e219b7bf3668f479c9e. Only I'm having the same problem. I'm just about ready to give up on 12.04.1 and just go back to 10.04 utill the next LTS comes out. I've got a dell mini 10 btw. Thanks for your time.

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• How long does boot repair take?

  - by Emre

  Reinstalling Ubuntu messed up my boot loader so I I tried to fix it with boot repair. It detected my OSX installation and asked about removing the "separate boot/EFI". It also said my partition was full despite the fact that it wasn't and asked me to remove stuff. I declined both and proceeded. It's been stuck at the "purge and reinstall the GRUB" stage for half an hour. Is this typical, bearing in mind I have a fast SSD and CPU? Is there a better way to re-install grub on a multi-booting UEFI system? Does my pastebin provide any insight?

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• Communication between state machines with hidden transitions

  - by slartibartfast

  The question emerged for me in embedded programming but I think it can be applied to quite a number of general networking situations e.g. when a communication partner fails. Assume we have an application logic (a program) running on a computer and a gadget connected to that computer via e.g. a serial interface like RS232. The gadget has a red/green/blue LED and a button which disables the LED. The LEDs color can be driven by software commands over the serial interface and the state (red/green/blue/off) is read back and causes a reaction in the application logic. Asynchronous behaviour of the application logic with regard to the LED color down to a certain delay (depending on the execution cycle of the application) is tolerated. What we essentially have is a resource (the LED) which can not be reserved and handled atomically by software because the (organic) user can at any time press the button to interfere/break the software attempt to switch the LED color. Stripping this example from its physical outfit I dare to say that we have two communicating state machines A (application logic) and G (gadget) where G executes state changes unbeknownst to A (and also the other way round, but this is not significant in our example) and only A can be modified at a reasonable price. A needs to see the reaction and state of G in one piece of information which may be (slightly) outdated but not inconsistent with respect to the short time window when this information was generated on the side of G. What I am looking for is a concise method to handle such a situation in embedded software (i.e. no layer/framework like CORBA etc. available). A programming technique which is able to map the complete behaviour of both participants on classical interfaces of a classical programming language (C in this case). To complicate matters (or rather, to generalize), a simple high frequency communication cycle of A to G and back (IOW: A is rapidly polling G) is out of focus because of technical restrictions (delay of serial com, A not always active, etc.). What I currently see as a general solution is: the application logic A as one thread of execution an adapter object (proxy) PG (presenting G inside the computer), together with the serial driver as another thread a communication object between the two (A and PG) which is transactionally safe to exchange The two execution contexts (threads) on the computer may be multi-core or just interrupt driven or tasks in an RTOS. The com object contains the following data: suspected state (written by A): effectively a member of the power set of states in G (in our case: red, green, blue, off, red_or_green, red_or_blue, red_or_off...etc.) command data (written by A): test_if_off, switch_to_red, switch_to_green, switch_to_blue operation status (written by PG): operation_pending, success, wrong_state, link_broken new state (written by PG): red, green, blue, off The idea of the com object is that A writes whichever (set of) state it thinks G is in, together with a command. (Example: suspected state="red_or_green", command: "switch_to_blue") Notice that the commands issued by A will not work if the user has switched off the LED and A needs to know this. PG will pick up such a com object and try to send the command to G, receive its answer (or a timeout) and set the operation status and new state accordingly. A will take back the oject once it is no longer at operation_pending and can react to the outcome. The com object could be separated of course (into two objects, one for each direction) but I think it is convenient in nearly all instances to have the command close to the result. I would like to have major flaws pointed out or hear an entirely different view on such a situation.

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• Ubuntu 12.04 suddenly will not boot after compiz crash on lockscreen

  - by schonjones

  Yesterday i went to work and closed my laptop. When i got home I couldn't get the lock screen to come back up. ctrl+alt+f2 to get to a terminal and Tried to kill compiz, compiz was not running so I tried to restart it got an error opening the display so i tried to restart lightdm again couldn't open display. so I restarted and now I am stuck on the loading screen. I tried booting in recovery mode and all options hang except root, but i'm stuck with read only. booting from a live cd I can mount the drive but again stuck with read only. I'm completely stuck here. checking my default-display-manager returns "/usr/sbin/elsa" as the only line and can't edit it. I've got an 11.10 live cd and my /home is encrypted so i can't try to back anything up at the moment either. How can i resolve this or at the least back up some of my data? Please help!

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• Wont boot from USB, stops at SYSLINUX copyright

  - by Steve

  Created bootable 11.10 in Windows from Universal USB Installer 1.8.6.8, upon boot in my HP Mini Netbook it displays only this: SYSLINUX 4.04 EDD 2011-04-18 Copyright (C) 1994-2011 H. Peter Anvin et al _(Blinky Cursor) I tried removing "ui" from syslinux.cfg, no change... (Re: can't install with usb pen drive, SYSLINUX problem) I also tried creating a bootable USB using unetbootin-windows-563, no change. Does anybody have any other ideas?

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