No login screen/Stuck at Ubuntu logo in 18.04

For Ubuntu 18.04, to resolve the issue, I have disabled Wayland in GDM3.

sudo vi /etc/gdm3/custom.conf

Change #WaylandEnable=false to WaylandEnable=false and reboot the system.

This can be done in either of the following ways,

1. Choose recovery mode, from advance option in grub menu and drop to root shell to modify file /etc/gdm3/custom.conf.
2. Set nomodeset to login,and follow the above steps. (In my case, I've already set.)
3. With live dvd or bootable media: make sure the path of your installed drive /media/ubuntu/XXX/etc/gdm3/custom.conf which can be found with df -h

UPDATE:

It seems like this bug has been fixed with upgrading mutter package, so if the above solution did not work out, try to upgrade mutter package or install Ubuntu 18.04.2 or if you have installed 18.04 then upgrade it with sudo apt update && sudo apt upgrade.

If Ubuntu 18.04.2 is installed, then there is no need to disable Wayland.