LXDE installed, but login screen has no option to login into LXDE

Solution 1:

I had the same problem and here's the fix: you need to install lxde-common after installing lxde. it includes lxsession and two other packages needed for lxde:

sudo apt install lxde-common

I don't know why dependencies aren't covered in this particular package.

Solution 2:

Amazingly, I installed lxsession package and reboot, finding that I have session lxde and openbox.

However, the logout button doesn't work, so I installed lxsession-logout, still I can't logout.

Then I remove lxsession-logout and install lxde-logout and all works. It seems that when install lxde-logout, lxsession-logout is automatically added.