$DISPLAY is not set or cannot connect to the X server
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$DISPLAY is not set or cannot connect to the X server.
Do not use startkde directly. Use startx and configure it to startkde.
Make sure that X Windows is properly installed, configured and running.
bash: startx: command not found
The result shows that X Windows is not properly installed.
Check your system installation guide to install X Server.
In you home directory, create a file named .xinitrc with this simple line: