My sed oneliner sudo sed -i s/admin/sudo/g /var/lib/dpkg/info/ruby-rvm.postinst
and later once again sudo apt-get install ruby-rvm -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/894311 Title: ruby-rvm's maintainer scripts expect the admin group to exist To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ruby-rvm/+bug/894311/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs