your /usr is world writable... this is a security issue, and probably the reason for the failure.
please fix it ** Changed in: virtualbox-ext-pack (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781113 Title: package virtualbox-ext-pack 5.1.34-0ubuntu1.17.10.2 failed to install/upgrade: new virtualbox-ext-pack package pre-removal script subprocess returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox-ext-pack/+bug/1781113/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs