System Graphical User Interface (GUI) Error and Solutions

It seems that during the package removal process, a critical system component might have been damaged. As a result, the graphical user interface (GUI) might have broken, and you are left with access only to the terminal.

To restore the GUI and fix missing packages, follow the steps below:

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1. Update System and Fix Missing Packages

Run the following commands in the terminal to try and repair any missing or broken packages:

sudo apt update
sudo apt install -f
sudo dpkg --configure -a

If the system is operational, these commands may restore missing dependencies.

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2. Reinstall GNOME or Desktop Environment

If the GUI is completely removed, you may need to reinstall the desktop environment. For Ubuntu, to reinstall the GNOME desktop environment, use:

sudo apt install ubuntu-desktop

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3. Restart Graphical Session

If the graphical session is broken, try restarting the display manager (e.g., gdm or lightdm):

sudo systemctl restart gdm

or

sudo systemctl restart lightdm

This will attempt to restart the graphical login and desktop environment.