Periodically snapcraft will fail to build because the version of snapcraft gets refreshed in the VM to the stable channel rather than copying snapcraft from the host. Launching a VM. snapd 2.43.3 from Canonical✓ refreshed Issues while validating snapcraft.yaml: The 'apps/snap-store/extensions[0]' property does not match the required schema: 'gnome-3-34' is not one of ['gnome-3-28', 'kde-neon'] snapcraft-snap-store # snap info snapcraft name: snapcraft summary: easily create snaps publisher: Canonical✓ store-url: https://snapcraft.io/snapcraft contact: https://forum.snapcraft.io/c/snapcraft license: GPL-3.0 description: | Package, distribute, and update any app for Linux and IoT. Snaps are containerised software packages that are simple to create and install. They auto-update and are safe to run. And because they bundle their dependencies, they work on all major Linux systems without modification. commands: - snapcraft snap-id: vMTKRaLjnOJQetI78HjntT37VuoyssFE refresh-date: today at 08:25 CET channels: stable: 3.10 2020-03-03 (4126) 62MB classic candidate: ↑ beta: ↑ edge: 3.10+git12.g51bd8359 2020-03-02 (4176) 62MB classic installed: 3.10 (4126) 62MB classic