Ubuntu – Can I automatically add a guest user (guest-session) to a user group? How to do it)

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I need guest users to be in a specific user group. I probably could create a new guest-account and add it to the group. But I'd rather like to use the existing guest-session-option integrated in Ubuntu (16.04). Is there any way to do it? I only found ways to automaticaly launch scripts/programs or costumize the startup-dialog.
Thank you very much in advance!

Best Answer

Yes. To make the guest users belong to mygroup, create /etc/guest-session/prefs.sh and add the line:

adduser $USER mygroup

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Ubuntu – How to add existing user to an existing group

The useradd command will try to add a new user. Since your user already exists this is not what you want.

Instead: To modify an existing user, like adding that user to a new group, use the usermod command.

Try this:

sudo usermod -a -G groupName userName

The -a (append) switch is essential. Otherwise, the user will be removed from any groups, not in the list.
The -G switch takes a (comma-separated) list of additional groups to assign the user to.

In general (for the GUI, or for already running processes, etc.), the user will need to log out and log back in to see their new group added. For the current shell session, you can use newgrp:

newgrp groupName

newgrp adds the group to the current shell session.

Ubuntu – add a user group to another group in Ubuntu

You have to add each user to the group CanView. You can't add a group to the group CanView.

But you could use ACL.

Best Answer

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