Linux Commands

This document provides a summary of various Linux commands and configurations.

GUI and Display Management

Switching Between GUI and TTY

  • Enable TTY (from GUI mode): Ctrl + Alt + F4
  • Enable GUI (from TTY mode): Ctrl + Alt + F1, Ctrl + Alt + F2, or Ctrl + Alt + F7

GNOME Display Manager (GDM)

If you are unable to enter GUI mode, the GNOME Display Manager (GDM) might have crashed.

  • Check GDM status:

      sudo systemctl status gdm3.service

  • Reinstall GDM and Ubuntu Desktop:

      sudo apt install --reinstall ubuntu-desktop gdm3

  • Start GDM:

      sudo systemctl start gdm3.service

Wayland Configuration

If you are unable to share your screen through a browser (like Chrome), you may need to disable Wayland.

  1. Edit GDM configuration:

     sudo nano /etc/gdm3/custom.conf

  2. Disable Wayland:

     WaylandEnable=false

Enable GUI App Opening from CLI

Set display variable:

```bash export DISPLAY=:1