I also have this issue. My PPTP connection was working fine and then I probably added some routes. And now I can't connect. Attach output from 'journalctl -u NetworkManager.service' command.
** Attachment added: "journalctl -u NetworkManager.service" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1608646/+attachment/5021227/+files/pptp_logs.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1608646 Title: ip4 static routes added in NetworkManager UI fail and prevent connection To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1608646/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs