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22.04 hasn't been released yet, so I would wait. You should be prompted to upgrade once it's available. Or you can run sudo do-release-upgrade at that time. If you have problems, please search and research before asking. If you still need help, make sure you provide clear details about the problem. Share what you found in your research and tell us why it didn't work for you. askubuntu.com/tour | askubuntu.com/help/how-to-ask
From 20.10 to 22.04 as per your title - No. From 21.10 to 22.04 after release - Yes. Please ensure you facts are correct & don't contradict. Also note: the *seamless upgrade assumes no 3rd party packages; if you have added 3rd party it'll depend on what you've added. Some will prevent upgrade from occurring, others will create problems; some are no problem. It'll be great if not using 3rd party packages though.
Thank you so very much Guiverc and Nmath. The main point of my question was upgrade from Xubuntu to Ubuntu. I recently put together a desktop and installed from scratch Ubuntu 21.04, or what I thought it to be, because when I logged in there are ubuntu options at the upper right corner but never understood what they are for as I always end up with the same Xubuntu. That's why I was asking. I use Ubuntu almost from start. I remember there were free Ubuntu install disks floating around at work. Yes I am also using 3rd party Nvidia drivers. Many thanks for your help. Best regards
sudo do-release-upgrade
at that time. If you have problems, please search and research before asking. If you still need help, make sure you provide clear details about the problem. Share what you found in your research and tell us why it didn't work for you. askubuntu.com/tour | askubuntu.com/help/how-to-ask