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Author Topic: Failed to open X11 display; make sure the DISPLAY env variable is set correct  (Read 9419 times)

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c-jay

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Hi,

after updating Ubuntu 14.01 to Ubuntu 16.01 xenial with KDE 4.14 I get this terminal error :

root@PC-Ubuntu:/home/user/test# ./TEST
Failed to open X11 display; make sure the DISPLAY environment variable is set correctly
 

If i run the code in Eclipse the window open correctly.

Some additional Informaion:
root@PC-Ubuntu:/home/user/test# echo $DISPLAY
localhost:10.0

root@PC-Ubuntu:/home/user/test# grep X /etc/ssh/sshd_config
X11Forwarding yes
X11DisplayOffset 10
 
Any idea how to fix?


c-jay

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solved-> don't run program as root