Ubuntu Cli Reset

Try configuring unconfigured packages:
sudo dpkg --configure -a
Update the contents of the repositories
sudo apt-get update
Try to fix missing dependencies:
sudo apt-get -f install
Update all packages with new versions available:
sudo apt-get full-upgrade
Reinstall Ubuntu desktop:
sudo apt-get install --reinstall ubuntu-desktop
Remove unnecessary packages:
sudo apt-get autoremove
Delete downloaded packages already installed:
sudo apt-get clean
Reboot the system to see if the issue was resolved:
sudo reboot