the app org.gimp.GIMP.Manual is findable via a command line search, but not from the website. It appears to be for an old version of GIMP (based on version number) and fails to run.
Maybe it should be removed? Or hidden from the command line search?
$ flatpak -u install org.gimp.GIMP.Manual
Looking for matches…
ID Branch Op Remote Download
- [✓] org.gimp.GIMP.Manual 2.10 i flathub 138.2 MB / 877.8 MB
Installation complete.
gary4@localhost:~$ flatpak run org.gimp.GIMP.Manual
bwrap: execvp /bin/sh: No such file or directory