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sudo systemctl stop lightdm
gdm
.Xprofile
.xsession
.old
startx
--verbose
sudo systemctl start lightdm
sudo systemctl stop lightdm(orgdmif it can't find the lightdm service).Xprofileand.xsessionor something like that to something else (I like to append.old)startx(try to append--verboseto see if it throws any useful logstartxdidn't work, trysudo systemctl start lightdm