How to repair Ubuntu installation after interrupted dist-upgrade without losing any custom settings?

Solution 1:

Do this:

• Switch on your computer.
• Press and hold the Shift key, which will bring up the Grub menu.
• Select the line which starts with Advanced options.
• Select the line ending with (recovery mode)
• Press Enter and your computer will begin the boot process.

Your computer should display a menu with a number of options.

One of the options will be Check all file systems:

• Press Enter with this option highlighted.
• One of the options will be Enable networking.
• Press Enter with this option highlighted.

Next, other of the options will be Drop to root shell prompt.

• Press Enter with this option highlighted.

Your computer should boot in a terminal enter the following commands there:

mount -o remount,rw /
mount --all
dpkg --configure -a
apt-get update
apt-get -f install
apt-get -m install
apt-get dist-upgrade
apt-get install --reinstall ubuntu-desktop
apt-get autoremove
apt-get clean