Step-by-step – NetBeans 21 IDE Installation in Debian Bullseye

Installing

2. 2. Setting Up Flatpak

   How to Setup Flatpak on Debian Linux

   Flatpak Debian Installation Guide

   Flatpak Debian Linux Setup

3. 3. Installing NetBeans 21

   Then to Install NetBeans 21 IDE on Debian Linux
   Simply run:

   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.apache.netbeans.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.