I have Debian Stretch. I installed lxqt Desktop Environment and successfully accessed a graphical desktop. Then I decided to enter it from a non graphical level by using a command
So I executed a command
# systemctl set-default multi-user.target.
But after reboot and typing the
$ startlxqt the Graphical Desktop did not start and an error appeared
QXcbConnection: Could not connect to display
How to fix it?