I had a group called sknowed. It was group ID 1004. The user admin was a part of this group. I then deleted the group with sudo  groupdel sknowed. When I execute groups command, I get a list of groups but one says 1004 instead of the name. 1004 was the original group ID. The group id 1004 is not present in /etc/group How can I deleted 1004 and the group?
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        spreaderman
        
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