07-14-2021, 03:32 PM
(This post was last modified: 07-14-2021, 04:57 PM by rich2005.
Edit Reason: typo
)
Best guess 
you installed the gimp-plugin-registry package from the ubuntu repo. 20 plugins and 164 scripts, most of which do not work with Gimp 2.10 I do wish that package was removed. My advice for this is uninstall it, it is junk.
xtns-lankinen-fiery-steel.scm is for at best Gimp 2.8 The syntax changed with Gimp 2.10 for example ADDITION becomes LAYER-MODE-ADDITION-LEGACY I will attach a fixed version for Gimp 2.10 if you want to try it. Unzip and put in ~/.config/GIMP/2.10/scripts/ (only that one, fix the others yourself)
Back to your initial problem. You really are using Gimp 2.10.8 ? You should update it. There was a bug round about Gimp 2.10.8 / 2.10.10 where the font selector was broken. In linux, you can get round that by clicking and dragging from the fonts dock into the script dialogue box. example: https://i.imgur.com/qemnzZw.jpg
There are still problems with that old script and older versions of Gimp. The script uses a bump-map and that was not applied in earlier version of Gimp 2.10. Seems to fixed now. This a comparison,
https://i.imgur.com/CYwEyf6.jpg The original script in Gimp 2.8 / the fixed up script in Gimp 2.10.14 / the fixed up script in Gimp 2.10.22. You can see the 2.10.14 is 'flat'The developers finally got backward compatibility for bump map.
Edit: If you want some scripts that have been successfully updated for Gimp 2.10 some here: https://www.gimphelp.org/script210.html At least you can browse and view examples.
you installed the gimp-plugin-registry package from the ubuntu repo. 20 plugins and 164 scripts, most of which do not work with Gimp 2.10 I do wish that package was removed. My advice for this is uninstall it, it is junk.xtns-lankinen-fiery-steel.scm is for at best Gimp 2.8 The syntax changed with Gimp 2.10 for example ADDITION becomes LAYER-MODE-ADDITION-LEGACY I will attach a fixed version for Gimp 2.10 if you want to try it. Unzip and put in ~/.config/GIMP/2.10/scripts/ (only that one, fix the others yourself)
Back to your initial problem. You really are using Gimp 2.10.8 ? You should update it. There was a bug round about Gimp 2.10.8 / 2.10.10 where the font selector was broken. In linux, you can get round that by clicking and dragging from the fonts dock into the script dialogue box. example: https://i.imgur.com/qemnzZw.jpg
There are still problems with that old script and older versions of Gimp. The script uses a bump-map and that was not applied in earlier version of Gimp 2.10. Seems to fixed now. This a comparison,
https://i.imgur.com/CYwEyf6.jpg The original script in Gimp 2.8 / the fixed up script in Gimp 2.10.14 / the fixed up script in Gimp 2.10.22. You can see the 2.10.14 is 'flat'The developers finally got backward compatibility for bump map.
Edit: If you want some scripts that have been successfully updated for Gimp 2.10 some here: https://www.gimphelp.org/script210.html At least you can browse and view examples.