https://www.lsjlt.com/news/375465.html
#use this command to update the system version from 18.04 to 20.04
#just follow the tutorial, and click 'yes' and 'keep version' etc..
#the first selection the system auto presents
#it takes 1h 30mim nearly
sudo do-release-upgrade
#use this command again update from 20.04 to 22.04
sudo do-release-upgrade
