OS Upgrade

Recommended

Check OS release

lsb_release -a
cat /etc/lsb-release
cat /etc/os-release

check packages with available upgrades

sudo apt update
sudo apt list --upgradable

upgrade steps

sudo apt clean
sudo apt autoclean
sudo apt update
sudo apt upgrade -y
sudo apt dist-upgrade
sudo do-release-upgrade

Upgrade using apt-fast - NOT TESTED

Update your software sources

do-release-upgrade

To point to the newer version of ubuntu. After it runs an update, and asks you to press enter to start the process of upgrade.

Open a new terminal, and start the upgrade, delete the lock file for apt first.

sudo rm /var/lib/apt/lists/lock
apt-fast dist-upgrade

Remember that this has to be entered on a new terminal, because, if you cancel the upgrade at that step, the upgrade rolls back the changes to the repositories.

After apt-fast finishes, you can shift to the original terminal and continue the upgrade