edit: removed comment on libgegl version - need more info on kubuntu version.
Edit: I think I see a possible problem. Are you using kubuntu Artful (17.10) ? That is the only 'buntu release in the PPA that has that version of GEGL 0.4 but gets you Gimp 2.10.4 not 2.10.12
You can try emailing the maintainer Thorsten Stettin - however the usual response is ...nothing.
Edit: I think I see a possible problem. Are you using kubuntu Artful (17.10) ? That is the only 'buntu release in the PPA that has that version of GEGL 0.4 but gets you Gimp 2.10.4 not 2.10.12
You can try emailing the maintainer Thorsten Stettin - however the usual response is ...nothing.