Use the following command in a terminal window to modify a user’s rights on Linux to make them a member of the adm group
$ sudo usermod -a -G sudo,adm username
<enter>
where username is the name of the user who you want to make a sudoer.
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Use the following command in a terminal window to modify a user’s rights on Linux to make them a member of the adm group
$ sudo usermod -a -G sudo,adm username
<enter>
where username is the name of the user who you want to make a sudoer.