I have found a bypass : use sudo dpkg-reconfigure lightdm
and switch from wayland (gdm3) to xorg (lightdm).
But this is a very temporary workaround as I think in the future lightdm won't be used anymore when they will deactivate Unity. Wow, it worked perfectly for me (Ubuntu 17.10 artful)! Note, that at the first time you type this command: sudo dpkg-reconfigure lightdm It may show you an error, that "lightdm" has not installed yet. If you're getting such a message, you should install the required package: sudo apt-get update
sudo apt-get install lightdm Then reboot your system or restart your X server. Hope TeamWork's developers team will find a way to solve this problem without switching display manager.
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