Current File : //proc/self/root/usr/lib/python3.6/site-packages/sepolicy/help/login_default.txt
The Login Mapping Screen has a special Login user called __default__. This record is used to setup the default login user for any login account that is not specified separately.
If this is a desktop system you might want to specify the user_u or xguest_u user. If this is a terminal server the guest_u user might be a good match.
Then you would need to add the admin users or a Linux group with a different label. Perhaps as unconfined_u or staff_u.
You could use %%wheel to indicate the wheel group.
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