Upgrade to Linux Mint 22 codename Wilma from 21.3,
sudo apt update
sudo apt install mintupgrade
sudo mintupgrade,
*Important --
select Linux Mint as mirror server "Americal Flag" 🇺🇸 for packages, if not it will show error packages.linuxmint.com is unreachable, after upgrade you can change to your local mirror server as before.
or you can edit the /etc/apt/source.list.d/official-package-repositories.list, replace the virginia main line with "deb https://fastly.linuxmint.io virginia main upstream import backport" save the file.
Then $ sudo apt update
Timecode --
system update 0:00
Install Mintupgrade 0:31
SKIP snapshot backup 1:30
Disable Third-party PPAs or Repos 1:55
Phase3 upgrade 2:48
Upgrade Successful 3:24
Reboot System 3:34
Linux mint Wilma Desktop 4:22
Check Version 4:31
End 4:46