The problem is still there on Ubuntu 18.04.4 LTS. The workaround from comment #30 works for me.
$ apt show ppp Package: ppp Version: 2.4.7-2+4.1ubuntu5 Status: install ok installed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1778946 Title: No dns resolution after closing a vpn/pptp connection To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ppp/+bug/1778946/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
