Kernel panic after upgrading to 2.2.20

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Autor: Miles Beck
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Assunto: Kernel panic after upgrading to 2.2.20
I installed kernel 2.2.20 because of a security advisory and now am getting
the following error message.

"Kernel panic: VFS: Unable to mount root fs on 72:02"

Does anyyone know how to correct this or get back to the previous kernel so
the server can still operate?