Same issue here. It shows the computer as online after a remote restart, but then I still cannot connect (just fails with no error message) until I log in locally. After that I can connect remotely and everything works fine. The target computer is running Ubuntu 18 and TeamViewer 14 (start with system is checked). Edit: see bobgutierrez's answer here: https://community.teamviewer.com/t5/Linux/Teamviewer-13-not-connecting-in-Ubuntu-18-04-Login-Screen/td-p/35342 It says: sudo gedit /etc/gdm3/custom.conf Uncomment this line in custom.conf file: WaylandEnable=false and Reboot.
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