This bug seems to be similar to my own experiences, so I'm adding this
comment to it.

After having my system upgraded yesterday (2009-01-30) using the package
linux-image-2.6.22-16-generic_2.6.22-16.61_i386.deb, I found today that
it was impossible to boot my computer. Upon selecting any entry in my
grub boot menu, I got "Error 15: File not found".

I looked at the commands in the grub command editor (by pressing E in
the boot menu screen) and saw that the "root" definition was incorrect
and the "UUID" for the "kernel" definition was also incorrect. These are
the definitions I saw:

root            (hd0,5)
kernel          /boot/vmlinuz-2.6.22-16-generic 
root=UUID=20ae8580-c8c7-4c16-a436-181b9e38a3a7 ro quiet splash
initrd          /boot/initrd.img-2.6.22-16-generic

I worked around this by setting "root" to "(hd0,0)" and by replacing the
"UUID=..." with "/dev/sda1", removing the "quiet" and "splash" options
so that I could actually see what happens, rather than seeing the
Kubuntu progress bar and then seeing absolutely no detail when switching
to text mode.

Upon looking at /boot/grub, I saw that menu.lst and menu.lst~ were both
updated yesterday and both were the same, so the update didn't preserve
the old contents of menu.lst. I have now changed the contents of
menu.lst back to what it was before.

I have recently switched hard disks in my computer, and the layout of
the partitions is different to those on my previous disk (which did use
"(hd0,5)" as the root partition, along with the "UUID" shown above).
However, I made sure to change menu.lst to use the new, correct values,
and I had successfully booted several times before this error occurred
today.

It might be the case that some other file is used to retain details of
the root partition and that the update scripts populate menu.lst with
values from this other file, but it is very bad that the scripts just
discard any existing copy of menu.lst, making an identical duplicate of
the new, incorrect file, and if such special files with disk information
then these should be documented somewhere.

** Tags added: grub menu menu.lst

-- 
Unable to boot Ubuntu server after update/upgrade
https://bugs.launchpad.net/bugs/321603
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