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Problem: Cannot switch a normal user to root using "su - ":
ls -l /bin/su
-rwxr-xr-x 1 root root 75747 Mar 4 2009 /bin/su
Cause: the sticky bit permission is not set on the file of the owner
Solution:
chmod u+s /bin/su
ls -l /bin/su
-rwsr-xr-x 1 root root 75747 Mar 4 2009 /bin/su
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