Repair a Broken Ubuntu Linux Installation

First try to login with an installation CD and back up as much data as you can.

At the login screen, press CTRL+ALT+F1 to switch to the tty1 console.

Now type the following commands one by one to fix the broken Ubuntu Linux installation:

sudo rm /var/lib/apt/lists/lock
sudo rm /var/lib/dpkg/lock
sudo rm /var/lib/dpkg/lock-frontend
sudo dpkg --configure -a
sudo apt clean
sudo apt update --fix-missing
sudo apt install -f
sudo dpkg --configure -a
sudo apt upgrade
sudo apt dist-upgrade

Now reboot the system using command:

sudo reboot

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