Can you give details of the OS version you are now using. The PandaJim packages are dependent on ubuntu (and equivalent Mint...) version. So only 20.04 / 21.10 / 22.04 (Mint 20.3 ?) get the latest Gimp 2.10.32
I am using kubuntu 20.04 and upgraded to Gimp 2.10.32 without problem. GEGL 0.4.36 is a dependency of libgimp and is updated along with Gimp, no need for a separate update. The same applies to libheif which is a Gimp package dependency.
My existing python 2.7 installation is still working.
Edit: Did you up-date the package list sudo apt update
I am using kubuntu 20.04 and upgraded to Gimp 2.10.32 without problem. GEGL 0.4.36 is a dependency of libgimp and is updated along with Gimp, no need for a separate update. The same applies to libheif which is a Gimp package dependency.
My existing python 2.7 installation is still working.
Edit: Did you up-date the package list sudo apt update