Unfortunately these logs don't bring any more insight as to what might be the problem (or at least, they don't help me figuring it out), it all looks like it connects fine?
Then the drei modem disconnects, either because it is pulled or fails in some way. Can you provide more information? Which modem was plugged in first, followed by which, so we can clearly see what is failing when you connect both simultaneously? >From what I can tell now the drei modem was first, followed by the t-mobile one, but unfortunately it's not the same NM or MM processes; ideally we should be able to see one full session with everything to tell what goes on. So far, I think we can safely say we've established it's not an issue with the modems and probably not ModemManager, so if you could run NetworkManager in debug mode just once to show a full session (connecting both modems, seeing each device loading the wrong connection). Here's how you can start NM in debug mode: (reboot first, so we have a clear starting point) sudo stop network-manager sudo /usr/sbin/NetworkManager --log-level=DEBUG --log-domains=CORE,HW,MB,PPP,AGENTS,SETTINGS,DEVICE The log-domains settings should allow giving all the information we need, while still being a manageable load. Reproduce the issue, then attach /var/log/syslog (after checking it doesn't contain sensitive information). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/627883 Title: Two mobile internet sticks conflict To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/627883/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs