I believe this is harmless, but not really know ;) Attached part of bootlog file (journalctl -b), containing this error
** Attachment added: "boot-log-part" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1728378/+attachment/5003784/+files/boot-log-part -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1728378 Title: NetworkManager: ((src/devices/nm-device.c:1452)): assertion '<dropped>' failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1728378/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs