My core22 snap uses the gnome extension. No specific version declared in the snapcraft.yaml:
extensions:
[gnome]
Builds for ppc64el fail with the following error:
Failed to install or refresh snap 'gnome-42-2204'.
'gnome-42-2204' does not exist or is not available on channel 'latest/stable'.
Use `snap info gnome-42-2204` to get a list of channels the snap is available on.
Yup. I don’t think there’s any plan to support s390x or ppc64el for the various desktop extensions.
Does anyone run any kind of desktop on machines running on a s390x or ppc64el platform?
If you have no plans to support your application on those architectures, I’d use the architectures section in your snapcraft.yaml to limit to the common arm64, armhf, and amd64 options, which are supported by the gnome extension.