All this means is exactly what's written: there is no device available to bring up the connection. Maybe at that time the modem isn't quite ready and needs a little more time to be fully initialized?
Please use "ubuntu-bug network-manager" to attach additional debugging information to this bug report. Above all, what we'll really need is to see the contents of /var/log/syslog which will include what's going on in NetworkManager and ModemManager when initializing the device. Just reproduce the issue with the error message then attach /var/log/syslog. ** Changed in: network-manager (Ubuntu) Status: New => Incomplete ** Changed in: network-manager (Ubuntu) Importance: Undecided => Low -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/921166 Title: nmcli always need restarting network-manager service for reconnect again To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/921166/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs