Ubuntu 20.04 LTS (Focal Fossa) was officially released on April 23 after two years since the release date of version 18.04. Ubuntu 20.04 features the latest LTS kernel 5.4 and it supports ExFAT file system by default so I can explore files in my Windows system wihtout any barries. It bring many other new features and higher performance as well compared to 18.04. Commands to upgrade from Ubuntu 18.04 $ sudo apt update && sudo atp upgrade -y $ sudo systemctl reboot # Login Loop issue may occur after reboot $ sudo apt dist-upgrade $ sudo apt autoremove $ sudo apt install update-manager-core -y $ sudo do-release-upgrade $ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=20.04 DISTRIB_CODENAME=focal DISTRIB_DESCRIPTION="Ubuntu 20.04 LTS" Issues during upgrading process Login Loop Issue: I cannot login system with a valid password after the first reboot: I googled and refered some online solutions like chown username: username .Xauthority, change grub file, etc., these ways cannot fix my issue: I cannot find an .Xauthority file in my home directory (the reason may be my computer is a dual-system) Other issues will occur after trying them The solution is: Press ALT + F3 to switch to another terminal, and excute the upgrade commands once again(without running the reboot command) and continue the upgrading process. The upgrade can be done in this terminal, and the issue will be fixed automatically once Ubuntu 20.04 is installed. It Upgraded to Ubuntu 19.10 at first, not 20.04 directly. I don't actually know the reason, solution: Repeat the upgrade commands to upgrade from 19.10 to the latest 20.04…