This affected me yesterday (2020-01-14), and today was able to work around it with R4kk00n's comment instructions.
I'm using an up-to-date Ubuntu 18.04, so this bug is clearly still there. Some data from my setup: Kernel: 4.15.0-74-generic x86_64 bits: 64 gcc: 7.4.0 Distro: Ubuntu 18.04.3 LTS $ apt show network-manager-pptp Package: network-manager-pptp Version: 1.2.6-1 (...) $ apt show network-manager Package: network-manager Version: 1.10.14-0ubuntu2 (...) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1511330 Title: PPTP connection does not establish due to error: "Connection activation failed: the VPN service returned invalid configuration." To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager-pptp/+bug/1511330/+subscriptions -- ubuntu-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs