I have installed Nvidia drivers then I restarted the laptop. When I typed exit on root@name:~# terminal, the following message appears in red:
Failed to start default target: Transaction for.graphical.target/start is destructive (emergency.target has \xe2\x80\x98start\xe2\x80\x99 job queued, but \xe2\x80\x98stop\xe2\x80\x99 is included in transaction)\nRun Code Online (Sandbox Code Playgroud)\n\nCan I downgrade to default graphics drivers using the terminal?
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