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Before adding accidentally a group twice to a user resulted in the following:
Updating members of group mygroup from ["sandro"] to ["sandro", "sandro"]...
Which was also twice in /etc/groups:
mygroup:x:999:sandro,sandro
With this patch this gets deduplicated and fixed:
<6>Updating members of group mygroup from ["sandro", "sandro"] to ["sandro"]... mygroup:x:999:sandro