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When using lightdm, when encountering a login loop after waking from sleep I can do Ctrl+Alt+F5 to drop into tty5 for example. After logging in, I write sudo service lightdm restart into the terminal, which logs out of the current session and brings me to a fresh login screen, thereby escaping the login loop.

However, when using gdm3, I cannot exit a login loop from tty5 using sudo serivce gdm restart in this way. The screen just turns black and the whole system needs a hard restart using the power button. I understand that gdm operates differently from lightdm. My question is:

What commands do I need to write in a tty to escape a login loop when using gdm?

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