How to Upgrade to Linux Mint 20.3 Una

Linux Mint has dubbed the new 20.3 release with the codename Una, the third major upgrade in the Linux Mint 20 series, which most would know is based on Ubuntu 20.04 LTS Focal Fossa distribution that will be supported until 2025.

The Linux Mint 20.3 release will have similar upgrades that were seen in the Ubuntu 20.04.3 LTS release; however will be sticking with Linux Kernel 5.4,

One of the more exciting things in this upgrade is dark mode support Celluloid, GNOME Terminal, Hypnotix, Pix, and XViewer applications in Cinnamon and MATE. Still, XFCE will not feature dark mode support Pix and XViewer due to the Xfwm window manager not supporting it.

In the following tutorial, you will learn how to upgrade to Linux Mint 20.3 codenamed Una using the terminal method.



Update Operating System

Update your Linux Mint operating system to make sure all existing packages are up to date:

sudo apt update && sudo apt upgrade -y

The tutorial will be using the sudo command and assuming you have sudo status.

To verify sudo status on your account:

sudo whoami

Example output showing sudo status:

[joshua@linuxmint ~]$ sudo whoami

To set up an existing or new sudo account, visit our tutorial on Adding a User to Sudoers on Linux Mint.

To use the root account, use the following command with the root password to log in.


The tutorial will be utilizing the terminal, and for those unfamiliar, this can be found in your show applications menu.


How to Upgrade to Linux Mint 20.3 Una

Import 20.3 Una Repository

First, replace the uma release with the new release codename una in your official-package-repositories.list file. This can be done quickly by using the following sed command.

sudo sed -i 's/uma/una/g' /etc/apt/sources.list.d/official-package-repositories.list

Before you continue, if you like, you can open the /etc/apt/sources.list.d/official-package-repositories.list file location to verify that the sed command worked successfully. This can be skipped.

sudo nano /etc/apt/sources.list.d/official-package-repositories.list

Example from:

How to Upgrade to Linux Mint 20.3 Una

Example to:

How to Upgrade to Linux Mint 20.3 Una

Once confirmed, exit by pressing CTRL+X on your keyboard.

Next, update your apt repository and begin preparing for the upgrade.

sudo apt-get update

Install Linux Mint 20.3 Una

Now that you have installed the repository and updated your apt-cache, you will have several packages to install. Begin the process with the following command.

sudo apt-get dist-upgrade

Example output:

How to Upgrade to Linux Mint 20.3 Una

Type Y, then press the ENTER KEY to proceed and upgrade your Linux Mint distribution.

Once complete, reboot your system. This can be done quickly by using the following command in your terminal.

sudo reboot

Post Installation Verify

Now that you have returned to your system, the default look may not look too different from the original regardless of whether you are using Cinnamon, XFCE, or MATE, as this wasn’t a significant upgrade.

Use the following command to verify the version of your Linux Mint system, which should now be 20.3 Una.


Or you can use the lsb_release command.

lsb_release -a

Example output:

How to Upgrade to Linux Mint 20.3 Una

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


Example output:

How to Upgrade to Linux Mint 20.3 Una

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

sudo apt install neofetch -y

Comments and Conclusion

In the tutorial, you have learned how to successfully upgrade from Linux Mint 20.2 to Linux Mint 20.3 using the terminal method.

Overall, this is frowned upon by the Linux Mint official team, unlike some other distributions. However, if your system is up to date and you have nothing specialized that you do not know how to maintain, this method can be much more straightforward and quicker for most users.

For users not on Linux Mint 20.2 Uma, do not just upgrade to Una straight away; modify the string and use the next major upgrade release to 20.3 to avoid clashes during upgrading.

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Juan Ehrenhaus
Thursday, January 6, 2022 5:26 pm

Hi, I just upgraded my LM 20.2 system to LM 20.3 following the instructions above.
The apt repositories for “one” were already available.
Excellent recommendation, clear and efficient.
Thanks for posting this guide.

Reply to  Juan Ehrenhaus
Sunday, January 9, 2022 10:47 pm

Спасибо большое!)

Juan Ehrenhaus
Thursday, January 6, 2022 5:46 pm

Hello again, please my auto-correction tool change the word “una” to “one”…. is it possible to change this error and finally, re-write the word una correspondingly ? thank you.

Juan Ehrenhaus
Thursday, January 6, 2022 6:04 pm

Sorry to bore you with this topic. The upgrade went smoothly and I have everything in perfect working order. The tutorial is great!
Only in my text above does it say “the repositories for “one”…. instead of “the repositories for “una”…..
This is what I wanted to correct… Thanks in any case for your attention.
Have a nice day.

Saturday, January 8, 2022 6:21 am

I share the sentiment; nice guide. To the point and worked the first time. THANKS!

Sunday, January 9, 2022 6:10 pm

Hello Joshua,

I too like to thank you for the instructions by upgrading to mint 20.3: it was easy( for me no technical personal) because of clear and precise commands. Thank you very much.
And I would appreciate very much your explanation about the troublesome appearance of the note by the (new) firefox with this upgrade: “your browser is being managed by your organisation”:
first, again, there was not or no note before this upgrade,
second, I have searched on internet about the significance but nothing, yet other user ask about it,
third, is it so because I defined firefox as main browser? then by chromium nothing changed (till now). Should I change the primary browser to chromium?
That frase is vexing, irritate me, I did click and I read so many true and false and I do not understand what all mean.
So, you are a Specialist: I truly hope that you read my question and that can give an answer, and I believe that those linux-upgrade-user could receive the answer here on your page.
Thank you for your attention. And thank you very much for your tutorials.

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