Hello,

A combination of all this advise allowed me to remove it. I couldn't remove it in x-term with sudo gainroot, I had to use root.

root

sed -i 's/bash/sh/g' /var/lib/dpkg/info/catblock.prerm

sed -i 's/bash/sh/g' /var/lib/dpkg/info/catblock.postinst

rm /var/lib/dpkg/info/catblock.prerm

rm /var/lib/dpkg/info/catblock.*inst

apt-get purge catblock

It is now gone