Upgrading to Linux Mint 21.1 "Vera" is a great way to get the latest features and upgrades for your system. The command line is the quickest and most efficient way to get the job done. 

Here at Fixwebnode, we shall look into the process of upgrading to Linux Mint 21.1 "Vera" using the command line. 

What to do before upgrading your Linux Mint system ?

Create a Time-Machine backup on the system

• Before you continue, your Linux Mint system should have Timeshift installed by default.
• Open this up using the /Administration/Timeshift menu path.
• You can also make a backup use the RSYNC method and creating a Snapshot of the system. To do this, simply click "create Snapshot".

1. Update your current version

You can Import 21.1 Vera Repository by using the following sed command:

$ sudo sed -i 's/vanessa/vera/g' /etc/apt/sources.list.d/official-package-repositories.list

Before you upgrade to Linux Mint 21.1 "Vera", it is important to update your current version. 

To do this, open a terminal window and type the following command: 

$ sudo apt-get update

This will check for any available updates and download them to your system. 

2. System Preparation (Optional and if using Destop)

Now, do the following:

• Disable your screensaver.
• If you installed Cinnamon spices (applets, desklets, extensions, themes), upgrade them from the System Settings.

3. Download the new version

Next, you need to download the new version of Linux Mint 21.1 "Vera". 

To do this, type the following command: 

$ sudo apt-get install linux-mint-21.1

This will download the new version of Linux Mint 21.1 "Vera" to your system. 

4. Upgrade your system (via commandline or Desktop)

Now that you have downloaded the new version of Linux Mint 21.1 "Vera", you need to upgrade your system. 

To do this, type the following command: 

$ sudo apt-get upgrade

This will upgrade your system to the new version of Linux Mint 21.1 "Vera".

Otherwise, on your Desktop,  from the Update Manager, click on the Refresh button to check for any new version of mintupdate or mint-upgrade-info. If there are updates for these packages, apply them.

Then, Launch the System Upgrade by clicking on "Edit->Upgrade to Linux Mint 21.1 Vera".

You will have to Follow the instructions on the screen.

If asked whether to keep or replace configuration files, choose to replace them.

5. Change artwork (optional if using Desktop)

Linux Mint 21.1 features artwork changes. The icons, the colors and the mouse cursor look different.

We recommend you reboot your computer for all changes to properly apply, then run the welcome screen to select your favorite color tones.

If you preferred the way Linux Mint looked prior to the upgrade launch the "Themes" settings. The 20.2 look is available under the name "Mint-Y-Legacy".

6. Reboot your system

Finally, you need to reboot your system in order for the new version of Linux Mint 21.1 "Vera" to take effect. 

To do this, type the following command: 

$ sudo reboot

This will reboot your system and you will be running the new version of Linux Mint 21.1 "Vera". 

What to do after installing Linux Mint 21.1 Vera ?

Use the following command to verify the version of your Linux Mint system, which should now be 21.1 Vera:

$ hostnamectl

Or you can use the lsb_release command:

$ lsb_release -a

Alternatively, use the following neofetch command to show a pretty output of your system specs in the terminal:

$ neofetch

If neofetch is missing, this can be installed using the following command:

$ sudo apt install neofetch -y

[Need help in upgrading your Linux System ? We can help you. ]