Display Manager gdm3 not working under Ubuntu 17.04 [closed]
Solution 1:
This is a well-known bug that has recently been fixed for 17.04 and earlier in the package nvidia-graphics-drivers-375.
Check this link for more details: https://bugs.launchpad.net/ubuntu-gnome/+bug/1559576
Installing that package should fix your issue.
Ubuntu 17.10 seems to still have the issue as of July 2017. For more details on that, check this link: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1705369
Update: the latest bug (1705369) has a workaround, check the the link for more details. Also, like @Tim Richardson mentioned in the comments, lightdm works. From the terminal, execute the following:
sudo dpkg-reconfigure lightdm
then choose lightdm.