There are a couple of steps required to make this work and, fortunately, it's not too crazy. Here's how you can do this:

0. Open Terminal (if it's not already open)

   
   



1. Create an apt source file for the Mint repository:

   
   

   _{For Ubuntu 20.04:}

   
   

   echo "deb http://packages.linuxmint.com una upstream" | sudo tee /etc/apt/sources.list.d/mint-una.list
   
   

   
   

   _{For Ubuntu 22.04 (and newer):}

   
   

   echo "deb http://packages.linuxmint.com vera upstream" | sudo tee /etc/apt/sources.list.d/mint-vera.list
   
   

   
   



2. To prevent NO_PUBKEY you have to add the GPG key by this:

   
   

   sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com A1715D88E1DF1F24 40976EAF437D05B5 3B4FE6ACC0B21F32 A6616109451BBBF2
   
   

   
   



3. Then update package lists by apt:

   
   

   sudo apt update
   
   

   
   



4. Prevent installation of other packages by pin-file:

   
   

   cat <<EOF | sudo tee /etc/apt/preferences.d/pin-chromium
   
   Package: *
   
   Pin: release o=linuxmint
   
   Pin-Priority: -1
   
   
   
   Package: chromium
   
   Pin: release o=linuxmint
   
   Pin-Priority: 1000
   
   EOF
   
   

   
   



5. Install chromium:

   
   

   sudo apt install chromium
   
   

   
   



6. Open chromium and check the About:
   
   ^{Note: You may want to change the landing page, which is all about Mint Una ?}

   
   

This will give you what you're looking for ??