I installed Ironhide (aka BumbleBee). It couldn't get it to work, but now I can't uninstall the package and it's preventing me from installing or removing anything else. Any ideas what I can do to fix this problem?
$ sudo apt-get remove -f ironhide Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: virtualgl acpi-call-dkms virtualgl-libs easybashgui Use 'apt-get autoremove' to remove them. The following packages will be REMOVED ironhide 0 upgraded, 0 newly installed, 1 to remove and 65 not upgraded. 1 not fully installed or removed. After this operation, 1,901 kB disk space will be freed. Do you want to continue [Y/n]? Y (Reading database ... 297969 files and directories currently installed.) Removing ironhide ... groupdel: group 'ironhide' does not exist dpkg: error processing ironhide (--remove): subprocess installed post-removal script returned error exit status 6 Processing triggers for ureadahead ... Errors were encountered while processing: ironhide E: Sub-process /usr/bin/dpkg returned an error code (1)