If your Ubuntu version or derivative has not packaged Inkscape 1.2.1 for you yet, you can install the current version from our ppa for Ubuntu 22.04, 20.04 and 22.10 (Ubuntu development version):

Desktop Instructions

1. Start the application "Software and updates"
2. Select the tab "Other Software"
3. Click the button "Add..."
4. Enter the following text

   ppa:inkscape.dev/stable

5. Click the button "Add Source"
6. Click on the button "Close"
7. When the pop up warns "The information about available software is out-of-date" click the button "Reload"
8. The latest stable version of Inkscape is now avaialble to be installed from the software center.

Command Line

sudo add-apt-repository ppa:inkscape.dev/stable
sudo apt update
sudo apt install inkscape