[Lucid] GRUB complains error: file not found

[Katsudon]

Binary package hint: grub2

Lucid Alpha 3, alternate install from USB.
I was upgrading a older Ubuntu install on LVM with separate volumes for /home, /, etc.
After restarting GRUB complains:

GRUB loading.
error: file not found

The output of set is:
prefix=(hd0,3)/grub
root=hd0,3

[Katsudon (katsudon)]

The contents of the /boot partition:

ubuntu@ubuntu:/mnt/grub$ ls -al
total 6
drwxr-xr-x 2 root root 1024 2010-03-07 19:48 .
drwxr-xr-x 4 root root 1024 2010-03-07 10:40 ..
-rw-r--r-- 1 root root 30 2010-03-07 10:40 device.map
-r--r--r-- 1 root root 2496 2010-03-07 19:48 grub.cfg

shows that a lot of files used by grub are missing, in particular core.img.
Therefore it seems that the source of the problem is the installer which failed to copy them.

[Katsudon (katsudon)]

Another attempt. Again, I installed Lucid Alpha 3 (alternate), this time with an access to the internet during the install in order to pull the updated packages.

This time, when computer boots, it greets me with the following error.

symbol 'grub_puts' not found
grub-recover >

Link to a discussion at Ubuntu Forums: http://ubuntuforums.org/showthread.php?t=1423884

[brandon (vangelismoux-gmail)]

I tried to install Ubuntu 10.04 by mistake on my 9.10 Ubuntu, so it asked me to remove so many important files because they couldn;t be updated. So i did, but then i lost all my Ubuntu and i had to reinstall again 9.10 . The reason i got as answer was that 10.04 does not support those files anymore.For me that means i'm gonna lose all my files even with backup if i shall try to install 10.04.