ubuntu Xt error: Can't open display: %s

Warning: This program is an suid-root program or is being run by the root user.

The full text of the error or warning message cannot be safely formatted

in this environment. You may get a more descriptive message by running the

program as a non-root user or by removing the suid bit on the executable.

/usr/X11R6/bin/xterm Xt error: Can't open display: %s

ubuntu 에서 X11 이 안뜨는건

# vi /etc/hosts

127.0.0.1       test 

위에 localhost 가 빠져서 그렇다

127.0.0.1       test localhost 

라고 입력해주면 정상적으로 X11 이 뜬다.