GRUB broken during upgrade to 11.04

[Freddy Van Ingelgom]

Hi everyone,
Yesterday I tried a test-machine with Ubuntu 10.10 and the urgrade to 11.04
worked fine. Then, I upgraded one of my operational computers, and since I
cannot start that computer anymore:
error: symbol not found: 'grub_env_export'
Then display "grub rescue>"
I found a lot of information on how to rebuild grub: nothing worked!
Is someone experiencing the same problem, and if so, did someone found a
solution?
Thanks for the help!
Freddy
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