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Not an answer, but a way how to easily switch between users: GDM stays open on TTY1, so you can switch to the login screen with ctrl+alt+f1 and then new user will be opened on next free TTY, ctrl+alt+f2 is the first logged in user, ctrl+alt+f2 the next one. Like this, you can directly switch between the TTYs / users.
ctrl+alt+f1
and then new user will be opened on next free TTY,ctrl+alt+f2
is the first logged in user,ctrl+alt+f2
the next one. Like this, you can directly switch between the TTYs / users.