A tutorial on how to upgrade from Linux Mint 20.3 to Linux Mint 21 and 21.1 was made available by DebugPoint.
Upgrade to Linux Mint 21 and 21.1 from Mint 20.3 [Complete Guide]
A complete tutorial on - how to upgrade to Linux Mint 21 and 21.1 from Linux Mint 20.3 with the graphical method.
Upgrade to Linux Mint 21 and 21.1 from Mint 20.3 [Complete Guide]