+1
I have the same problem, Appimage on Linux Mint 20.3 does not start, same error messages as above.
“GLIBCXX_3.4.29” and “GCC_12.0.0” not found.
I thought, the Appimage has no requirements (according to the documentation:
" Kdenlive on Linux[¶]
Kdenlive can be installed on non-KDE Desktops without any issues.
Packages: Minimum Ubuntu 22.04 for PPA. AppImage, Snap or Flatpak have no such minimal requirements."
Any ideas how to make the appimage work?