The main cause for this error (see below) is due to su not being set to a setuid of root.
su: cannot set groups: Operation not permitted
chmod u+s /bin/su
Latest posts by Rick Donato (see all)
- How to Configure a BIND Server on Ubuntu - March 15, 2018
- What is a BGP Confederation? - March 6, 2018
- Cisco – What is BGP ORF (Outbound Route Filtering)? - March 5, 2018
Want to become a Linux expert?
Here is our hand-picked selection of the best courses you can find online:
Linux Mastery course
Linux Administration Bootcamp
and our recommended certification practice exams:
AlphaPrep Practice Tests - Free Trial