[Bug 613195] Re: package mysql-server-5.1 5.1.41-3ubuntu12.3 failed to install/upgrade: Package is in a very bad inconsistent state - you should reinstall it before attempting a removal.

[Thierry Carrez]

I'd try reinstalling the package from the archive, something like

sudo apt-get install mysql-server-5.1
or
sudo apt-get install --reinstall mysql-server-5.1

since it sounds like it's in a too bad shape to even uninstall properly.

-- 
package mysql-server-5.1 5.1.41-3ubuntu12.3 failed to install/upgrade: Package is in a very bad inconsistent state - you should  reinstall it before attempting a removal.
https://bugs.launchpad.net/bugs/613195
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