Fixed by following instructions at https://wiki.ubuntu.com/DebuggingModemmanager/ (upgraded everything in the repository)
The NM_PPP_DEBUG revealed an error after upgrading to daily, in /tmp/nm.log.txt /usr/sbin/pppd: /usr/lib/pppd/2.4.5/nm-pppd-plugin.so: cannot open shared object file: No such file or directory /usr/sbin/pppd: Couldn't load plugin /usr/lib/pppd/2.4.5/nm-pppd-plugin.so Fixed by temporarily downgrading to the standard version, grabbing a copy of nm-pppd-plugin.so, then going back to the nightly version. Happy days! -- modem-manager: Got failure code 100: Unknown error https://bugs.launchpad.net/bugs/516132 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs