I found the following page online https://bluesabre.org/2019/10/20/install-xubuntu-19-10-on-a-raspberry-pi-4/
the claim is that this bug is in the greeter and it has been fixed upstream. i followed the directions to install a different greeter and the xubuntu now works. i had updated to the latest kernel (1014) before trying this fix but it did not help. The blog did not give a pointer to the upstream fix but it sounds like you are a pull away from fixing this. Kenny -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1849886 Title: lightdm does not work on eoan on raspberry pi 4 Status in lightdm package in Ubuntu: Confirmed Bug description: if you follow the directions on https://wiki.ubuntu.com/ARM/RaspberryPi sudo apt-get install xubuntu-desktop about 20% thru the installation it will ask which window manager you want (using dpkg-reconfigure). if you select lightdm, you will only get a blank greeter screen after you reboot. using sudo dpkg-reconfigure gdm3 resets this to gdm3 and after a reboot, everything is fine. this was done on a clean armhf eoan install on a 4gb raspberry pi 4B. I have done the install several times. This bug is repeatable. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1849886/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
