There should be consistency in /etc/group and /etc/gshadow.

Run the grpck command to check that these two files reconcile.

grpck

result:

no matching group file entry in /etc/gshadow
add group 'sambasecureshare' in /etc/gshadow? y
'john' is a member of the 'sshusers' group in /etc/group but not in /etc/gshadow
'root' is a member of the 'tomcat' group in /etc/gshadow but not in /etc/group

As can be seen there are a number of inconsistencies.

Lets fix these.

Action:

• Accept the offer to add the group 'sambasecureshare' in /etc/gshadow by entering a 'y' and pressing enter.

• Add 'john' to the 'sshusers' group in /etc/gshadow manually.

• We don't want root to belong to the 'tomcat' group, so we remove this from /etc/gshadow.