Examining the information you have given us, you reported a bug against the .deb package while intending to report a bug against the snap package, which has a different maintainer.
Snap packages are not exclusive to Ubuntu.
According to `snap info gthumb-unofficial` (the only known package of gthumb that is snapped):
Examining the information you have given us, you reported a bug against the .deb package while intending to report a bug against the snap package, which has a different maintainer.
Snap packages are not exclusive to Ubuntu.
According to `snap info gthumb-unofficial` (the only known package of gthumb that is snapped):
contact: https:/ /buechner. me
That is the person that should be contacted, not a bug in Ubuntu.