I installed MATE 1.26 under Debian testing amd64 last night and I was unable to mount my phone via MTP under Caja until I ran sudo system stop udisks2 So I now I have just disabled the udisks2 service so that I can access my phone via MTP fine. I can still access removable USB disks fine without udisks2 so what purpose is it serving being installed by default when you install mate under Debian?