Step-by-step | Krita Installation in Debian Buster

Installing

2. 2. Setting Up Flatpak

   How to Setup Flatpak on Debian Buster

   Flatpak Debian Buster Installation Guide

   Flatpak Debian Buster Setup

3. 3. Installing Krita

   Then to Install Krita App on Debian Buster
   To Setup the Repo play:

   flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

   For further Insight see the Flatpak Official Documentation.
   And after:

   flatpak install https://flathub.org/repo/appstream/org.kde.krita.flatpakref

   The Flatpak App Setup do Not need the sudo Command because then it Runs confined into a Sandbox.
   However, you’ll be Prompted to Authenticate with your User’s Admin Pass.
   Then Confirm the proposed Setup with ‘Enter’ and Wait patiently until the App is Downloaded and Installed.