GNU/Linux Mint 20 Updating System Guide
The tutorial shows you step-by-step How to Update Packages & System on Mint 20.x Ulyana/Ulyssa/Uma/Una LTS GNU/Linux desktop – Step by step Tutorial.
And here I explain How to Update/Upgrade Mint 20 easily on Command Line.
You may also be interested in learning How to Update/Upgrade Kernel.
Especially relevant: after if the suited result is Not achieved, you may be also interested about How to Upgrade Kernel on Mint.
And Mint dispose of 2 possible Solutions:
- Upgrade the Current Release
- Upgrade to Next Release (The last only in case a New Version is available)

1. Terminal QuickStart
How to QuickStart with Command Line on Mint:
First Update the Apt Repo Sources with:
sudo apt update
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