如何在Ubuntu 18.04 gdm3/Gnome中修改默认会话？

Hey there! Switching the default session to Ubuntu on Wayland for new users in Ubuntu 18.04 GNOME is straightforward. Let’s walk through the steps:

• First, confirm the exact name of the Wayland session desktop file. Open a terminal and run this command:

  ls /usr/share/wayland-sessions/
  

  You should see a file named ubuntu-wayland.desktop – this is the target session file we need.

• Next, edit the GDM3 configuration file (GNOME uses GDM3 as its default display manager in 18.04). Use this command to open the file with sudo privileges:

  sudo nano /etc/gdm3/custom.conf
  

• In the opened file, locate the [daemon] section. If it doesn’t exist, add it at the top of the file. Then add or modify the following line to set the default session:

  DefaultSession=ubuntu-wayland.desktop
  

• Save your changes by pressing Ctrl+O, then press Enter to confirm the filename. Exit the nano editor with Ctrl+X.

• To apply the changes, restart the GDM3 service:

  sudo systemctl restart gdm3
  

  Alternatively, you can reboot your system if you prefer a full restart.

Once done, any new user you create will have "Ubuntu on Wayland" pre-selected as their default session when they log in for the first time.

A quick note: Wayland may have compatibility issues with certain older hardware or proprietary graphics drivers (like NVIDIA’s closed-source drivers). If you encounter problems after switching, you can revert back by changing the DefaultSession value to ubuntu.desktop (the Xorg-based session) and restarting GDM3 again.

内容的提问来源于stack exchange，提问作者materangai