I still use Gimp 2.10.22 appimage on a daily basis, in a (k)ubuntu 18.04 machine.
It now looks like the appimages, for whatever reason, are discontinued. The latest (last) 2.10.25 appimage(=2.10.24) is very good and worth using.
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I'm on GIMP 2.10.18 and I can see the Resynthesizer plugin but not the Liquid rescale, and I couldn't find anywhere to download the plugin files.
I also have a (k)ubuntu 20.04 machine and to keep up-to-date use the Panda Jim PPA, Gimp 2.10.28 That works very well but you need to install python support yourself, needed for the resynthesizer 'heal' python plugins. That is also true for the stock 'buntu Gimp 2.10.18 Do you have python support ?
For liquid rescale & Gimp 2.10.18 and later, there is a dependency, liblqr which needs installing. That is in the ubuntu repo and is installed:
sudo apt install liblqr-1-0
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I downloaded the snap GIMP 2.10.24 and it doesn't seem to come with Liquid rescale
This is a problem with the Gimp snap version. It is 'sandboxed' and will not 'see' the regular lib file so the liquid rescale plugin does not work. A while since I tried it but not impressed.
You could replace the Gimp 'snap' version with the Gimp 'flatpak' That is sandboxed as well, but comes with python 2 support. Various popular plugins have flatpak versions, resynthesizer, liquid rescale, gimp_gmic_qt for installation.