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10.4.3. Booting into a Graphical Environment

If you have installed the X Window System but are not seeing a graphical desktop environment once you log into your system, you can start the X Window System graphical interface using the command startx.
Once you enter this command and press Enter, the graphical desktop environment is displayed.
Note, however, that this is just a one-time fix and does not change the log in process for future log ins.
To set up your system so that you can log in at a graphical login screen, you must set the graphical systemd boot target as the default target. The system boots to the target described in the file, which is a symbolic link (or symlink) to a specific target file.
Open a shell prompt. If you are in your user account, become root by typing the su command.
Now, type the following command to create a new symlink to the graphical target, which we will call default2:
   ln -s /lib/systemd/system/ /etc/systemd/system/ 
Then, overwrite the current symlink with the new symlink:
   mv /etc/systemd/system/ /etc/systemd/system/ 
You will be prompted to confirm whether the file should be overwritten. Press y followed by Enter.
The next time you log in after rebooting your system, you are presented with a graphical login prompt.