Fresh install of 18.04 on an Intel NUC. Worked at first but now when I get to the login screen, it takes about a minute before my keyboard and mouse respond. My password is not accepted on the first attempt but on the second it is. On finally being allowed to log in, I am presented with a purple screen with no desktop.
Edit: I managed to get back in via a hard reboot but that's not an ideal solution.
Edit 2: Complete shutdown followed by disconnecting from the mains allows me to start up normally next time. Reboot or REISUB leads to issues described above.