The most common cause of this error message is due to wrong SUID set on the user permissions for
When you do an
ls -lt /bin/su you should see the following permissions:
-rwsr-xr-x 1 root root 47522 Aug 12 2003 /bin/su -rwsr-xr-x. 1 root root system_u:object_r:su_exec_t:s0 75736 May 20 2020 /us...
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