Force package removal
2015-01-27 - How to force the removal of a package on Debian
How to force the removal of a package
Here is how to force package removal when post-uninstall script fails :
dpkg --purge --force-all <package>
There is another option if you need to be smarter or if it is a pre-uninstall script that fails. Look at
/var/lib/dpkg/info/<package>.*inst, locate the line that fails, comment it out and try to purge again. Repeat until success!