Ubuntu has released last month the LTS version, one that comes every two years and with Long Term Support of five years.
I was using 18.04 in my laptop and now I will upgrade to 20.04, so, how to upgrade Ubuntu?
As I always prefer the terminal, let's do it that way.
Update and upgrade your current release
sudo apt-get update && sudo apt-get upgrade
In case of Kernel upgrade, reboot it.
Delete not used packages
sudo apt-get autoremove
With that command I got the message that there is no new release available, but we know there is one, so let's force Ubuntu to find and install it.
sudo do-release-upgrade -d
Answer yes, and wait, you will end with the new version of Ubuntu. Do not force the upgrade on servers, better wait until Canonical makes it available for your, I am doing this only in my laptop.