You are trying to downgrade from 5.1 to 5.0 which isnt supported.
Regards
chuck
** Changed in: mysql-dfsg-5.0 (Ubuntu)
Status: New => Won't Fix
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package mysql-server-5.0 (not installed) failed to install/upgrade:
sub-processo novo script pre-installation retornou estado de saída de erro 1
https://bugs.launchpad.net/bugs/564213
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