reinstalling the software from HP https://developers.hp.com/hp-linux-imaging-and-printing/gethplip
fixed the problem. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781420 Title: package python3 3.6.5-3ubuntu1 failed to install/upgrade: installed python3 package post-installation script subprocess returned error exit status 4 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/python3-defaults/+bug/1781420/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs