After update and reboot I get 'user is not in the sudoers file. This incident will be reported.' when trying to call sudo. The problem is that I don't have a GRUB with revovery option. I try to boot from live cd but I'm not able to access the system partition, only the partition with grub. Can I somehow enable the recovery mode in GRUB? Or boot throw the live CD from first hard drive with some option for that?
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3 Answers
Ubuntu's "recovery" is just another name for "single user mode". You can access it by adding the option single to the kernel line in grub. (It used to be the e key; I don't know how to do it in grub2.)
answered May 14, 2010 at 18:19
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3@martin.malek Please explain what happens, not just 'it does not work'. Does it ask for a password, does it give an error, does it boot normally as if you didn't enter 'single', etc etc– davrMay 14, 2010 at 18:57
If you're not seeing a Grub menu at boot time, it's probably hidden. Hold down Shift when booting to unhide the boot menu. Your recovery options should be there.
This assumes (1) you're using Grub as your bootloader, and not Win7's boot manager; and (2) you've left Grub in a default configuration. If you've tweaked your Grub menu, for example to remove the recovery options, this doesn't apply.
answered May 14, 2010 at 18:35
Ok, solved. When I was not able to run it in single mode, this helped: http://www.cyberciti.biz/faq/howto-boot-ubuntu-linux-rescue-mode/
answered May 14, 2010 at 18:35
fdisk -l(while booted into the LiveCD) so we can help you better.