having some spare time and thanks to @realthunder of FreeCAD forum, I have managed to build KiCad AppImage with plugins support:
here the latest AppImage builds…
I have tested those on Ubuntu and Mint 20.4 LTS and it seems there are no issues:
KiCAD 5.1.12
KiCad-5.1.12.glibc2.29-x86_64.AppImage
KiCAD 6.0.4
KiCad-6.0.4.glibc2.29-x86_64.AppImage
KiCAD 6.0.5
KiCad-6.0.5.glibc2.29-x86_64.AppImage
Since AppImage is a ‘portable’ package, version 5.1 and 6.0 can be used side by side.
Both AppImage have the ability to run standalone each single kicad package like i.e. pcbnew
$ ./KiCad-6.0.4.glibc2.29-x86_64.AppImage pcbnew
$ ./KiCad-6.0.4.glibc2.29-x86_64.AppImage pcbnew ~/Downloads/example.kicad_pcb
Note: after having downloaded the AppImage, you need to make it executable with the Gui or the command:
chmod a+x ./KiCad-6.0.4.glibc2.29-x86_64.AppImage