E: /var/cache/apt/archives/mysql-server-5.0_5.1.30really5.0.83-0ubuntu3_i386.deb: Aborting downgrade from (at least) 5.1 to 5.0.

[lel24.lel24]

E: /var/cache/apt/archives/mysql-server-5.0_5.1.30really5.0.83-0ubuntu3_i386.deb: subprocess new pre-installation script returned error exit status 1

ProblemType: Package
Architecture: i386
Date: Tue Dec 29 11:08:06 2009
DistroRelease: Ubuntu 9.10
ErrorMessage: subprocess new pre-installation script returned error exit status 1
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
Package: mysql-server-5.0 (not installed)
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: mysql-dfsg-5.0
Title: package mysql-server-5.0 (not installed) failed to install/upgrade: subprocess new pre-installation script returned error exit status 1
Uname: Linux 2.6.31-14-generic i686

[Jean-Baptiste Lallement (jibel)]

Thanks for your report.

It seems that you're trying to install MySQL 5.0 while having 5.1 already installed. Downgrading from 5.1 to 5.0 is not supported.
Could you try to uninstall 5.1 first (backup your database and completely purge the 5.1 packages) ?
PS: Doing so may result in a data loss.

[Jean-Baptiste Lallement (jibel)]

 We are closing this bug report because it lacks the information we need to investigate the problem, as described in the previous comments. Please reopen it if you can give us the missing information, and don't hesitate to submit bug reports in the future. To reopen the bug report you can click on the current status, under the Status column, and change the Status back to "New". Thanks again!