If I want to add my user to new groups (for example sudo) I run
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adduser <myuser> sudo
After this I can typ
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id <myuser>
But only typing
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id
The thing is, this does not work with GDM!
Logout and in again does not show the new group membership when issuing command
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id
I have also tried completely killing GDM and starting it again.
Nothing works. The only thing that really works is to reboot the computer.
I have not tried any other login managers so I don't know if this is a design bug/miss or maybe only a but in GDM.