...but does it work? Do the sliders change the image ?
Probably the version of Gimp you have installed, 2.10.36 That is the default version for ubuntu 24.04 and probably the snap version if you used the ubuntu software center. Do you know is it is a snap ?
Not much you can do.
You could try the PPA version https://launchpad.net/~ubuntuhandbook1/+...buntu/gimp
or
The flatpak version from gimp.org
or
This appimage https://github.com/TasMania17/Gimp-Appim...p-v2.10.38
otherwise back to using the color-curves tool.
Probably the version of Gimp you have installed, 2.10.36 That is the default version for ubuntu 24.04 and probably the snap version if you used the ubuntu software center. Do you know is it is a snap ?
Not much you can do.
You could try the PPA version https://launchpad.net/~ubuntuhandbook1/+...buntu/gimp
or
The flatpak version from gimp.org
or
This appimage https://github.com/TasMania17/Gimp-Appim...p-v2.10.38
otherwise back to using the color-curves tool.