Boot Ubuntu Linux into Rescue mode to fix system

To boot Ubuntu Linux into rescue mode to fix a system issue, you will need to boot from the Ubuntu installation media (e.g. a DVD or USB drive).

Here's how to boot Ubuntu Linux into rescue mode:

1. Insert the Ubuntu installation media into your computer and restart it.

2. Press the appropriate key to enter the boot menu (usually the "Esc", "F12", or "F8" key). The key to enter the boot menu may vary depending on your computer's manufacturer and BIOS.

3. From the boot menu, select the option to boot from the installation media.

4. On the Ubuntu boot menu, select the "Try Ubuntu" option. This will boot into a live session of Ubuntu without installing it on your computer.

5. Once the live session has loaded, open a terminal and enter the following command:

sudo ubuntu-support-status

This will show you the status of the installed packages on your system. If any packages are broken or missing, you can use the apt-get command to repair or reinstall them.

For example, to repair a broken package, you can use the following command:

sudo apt-get install --fix-broken

To reinstall a package, you can use the following command:

sudo apt-get --reinstall install package_name