Does not seem specific to Mate, here is Ubuntu Budgie 18.04 → https://discourse.ubuntubudgie.org/t/hplip-hplip-toolbox-broken-in-budgie/2749/26?u=coeur-noir
Does not seem specific to Mate, here is Ubuntu Budgie 18.04 → https:/ /discourse. ubuntubudgie. org/t/hplip- hplip-toolbox- broken- in-budgie/ 2749/26? u=coeur- noir