I'm not sure if this is actually the same bug, but I fixed an issue with the same symptoms, documenting here for the sake of those who come after me:
The NetworkManager tool asks you to input a subnet mask in "dotted-quad" format, however, if you look at the config file created for the connection in /etc/NetworkManager/system-connections, you see that it converts it to /CIDR notation. However, I had input some routes which didn't actually properly map to a CIDR network specification, which was causing the ip-route add command to fail with an "RTNETLINK answers: Invalid argument" error message. Correcting or removing these routes fixed my issue. -- 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 [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
