Reading from the usermod manual, this is expected behavior:
-G, --groups GROUP1[,GROUP2,...[,GROUPN]]]
A list of supplementary groups which the user is also a member of.
Each group is separated from the next by a comma, with no
intervening whitespace. The groups are subject to the same
restrictions as the group given with the -g option.
If the user is currently a member of a group which is not listed,
the user will be removed from the group. This behaviour can be
changed via the -a option, which appends the user to the current
supplementary group list.
** Project changed: ubuntu-mate => ubuntu
** Package changed: ubuntu => shadow (Ubuntu)
** Changed in: shadow (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1682759
Title:
usermod -G username:www-data remove primary user from sudoers group
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