Csabeenémet fórumon még volt egy link: http://www.webupd8.org/2010/01/try-new-plymouth-in-ubuntu-lucid-alpha.html
http://computersupportforums.com/showthread.php?tid=7291
illetve talán itt: http://askubuntu.com/questions/1889/kernel-2-6-32-20-doesnt-boot-root-file-system-does-not-exist
what is your kernel configuration ? – SjB Aug 10 '10 at 21:04
This are original Ubuntu packages. So the config is the same as in linux-image-2.6.32-XY-generic (XY is UBuntus minor version). – qbi Aug 11 '10 at 7:57
Have you tried adding nosplash and noplymouth, and removing quiet in your GRUB_CMDLINE_LINUX_DEFAULT line in /etc/default/grub ? – Suppressingfire Aug 11 '10 at 19:19
I tried noplymouth as a temporary option at grubs commandline and also completely deinstalled plymouth. In both cases I saw the error message. I also removed quiet and splash temporarily, no effect. In my opinion nosplash should lead to the same effect as removing splash. So I never tried this. – qbi Aug 11 '10 at 19:36
At the moment I'm trying to build a recent plain vanilla kernel from kernel.org and track the bug down.
It's possible that your drive is not coming online fast enough and the kernel is giving up on it before it is ready. There's a way to test this to work around it.
The instructions below assume you are running Ubuntu 9.10 or later. If you are running an earlier release, you can see https://help.ubuntu.com/community/GrubHowto for instructions on performing the edits below.
When rebooting your system, select the kernel to boot (you may need to hold shift while the system is booting to see the GRUB bootloader menu, depending on your setup). Then press 'E' to edit the boot options.
Scroll to the line that starts with "kernel" and move the cursor to the end of the line. At the end of that line, add a space and "rootdelay=60". This will tell the kernel to wait up to 60 seconds for your drive to become ready. Then press Control-X to boot.
If all goes well, your system will boot. If this is the case, you can make the changes permanent by adding them to the default boot options. To do this, open a terminal (Applications - Accessories - Terminal) and type:
sudo gedit /etc/default/grub
Find the line that looks like:
GRUB_CMDLINE_LINUX=""
and change it to
GRUB_CMDLINE_LINUX="rootdelay=60"
Finally, run
sudo update-grub
to make sure your changes are properly picked up.
For more information about the options available in the bootloader, you can see https://help.ubuntu.com/community/Grub2 . (There is a bug report about this delay for specific hardware at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/482327 .)