Unable to take screenshot

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What makes you think it is a confinement issue, what are the specific denials related to screenshotting you get ?

Classic confinement is only granted for applications fitting the list on:

Process for reviewing classic confinement snaps

Classic confinement review process Background As of snapd 2.20, snappy supports confinement: classic which allows the snap to run without restrictions. Future releases of snapd will also support a classic interface (name TBD) that operates similarly. Snaps specifying classic confinement may target the stable channel, but are only supported on classic distro systems (ie, not on Ubuntu Core). Because classic confinement snaps run without restrictions, use of classic confinement effectively gran…