[ubuntu] VM unable to login

Host - Ubuntu 18.04
VM - Ubuntu 18.04
VirtualBox

VM (newly installed) - unable to login. It freezes.

This happens after installing virtualbox-guest-x11 because copy/paste not working between host and vm.

Advanced
Shared Clipboard: [Bidirectional] # already selected
Drag'n'Drop: [Bidirectional] # already selected

I have reinstalled VM twice with same result.

Please help. Thanks

Regards
satimis