I may have misidentified the affected package. Further testing indicates that while the USB adapter works fine in all three USB-C ports under Windows, the connection problem I've reported above appears only when I use either of the two USB-C ports (described as USB Type-C/Thunderbolt 3/Power (DC) input combo port by Asus), but not when I use the remaining port (described as USB Type-C/Power (DC) input combo port).
Thus, in the Thunderbolt 3-capable ports, under Ubuntu, it doesn't work. In the non-Thunderbolt-port it does work: -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1796355 Title: USB-C ValueLine network adapter fails to connect To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1796355/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs