「Perhaps you do not have console ownership?」エラーでstartxできない

「su – [user]」でユーザーを切り替えて、startxしようとしたら、
「Perhaps you do not have console ownership?」エラーでstartxできなかった時のめも


# su - oracle
Last login: Tue Sep 22 15:00:07 UTC 2020 on tty1


[oracle@localhost ~]$ startx
Fatal server error:
(EE) PAM authentication failed, cannot start X server.
	Perhaps you do not have console ownership?
Please consult the The X.Org Foundation support
	 at http://wiki.x.org
 for help.
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error
Couldn't get a file descriptor referring to the console


参考:runlevel 3 でコンソールから “startx” コマンドを実行すると、PAM 認証エラーが発生します