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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 $ startlxqt.

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?

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