You can also edit the files manualy using filebox, navigate to file "/var/lib/dpkg/info/catblock.prerm" press and hold then select edit, then once you have changed the file from #!/bin/bash to #!/bin/sh choose save from the top drop down menu, then repeat the same steps for "/var/lib/dpkg/info/catblock.postinst" Once you have done that you can just remove it in the normal way For me its so much easier to use a file manager (and filebox is exelent) as i get far too easily lost with all the commands in xterm