I continue to run into issue after issue since I upgraded to PopOS Cosmic. Wayland will not let me have access to my USB serial port.... After 3 hours of fighting with different apps and terminals I finally, on a whim, switched to tty2 (ctrl-alt-F2) and logged in text mode and cu was able to access /dev/ttyUSB0 from there.
Also still haven't got my VPN connections to work.
I'm very disappointed that @pop_os_official didn't give more of a heads up that a lot of stuff on my system wasn't going to work with Wayland.