14:34:31: Running steps for project foobar...
14:34:31: Starting: "/home/user/.config/ubuntu-sdk/ubuntu-sdk-15.04-i386/make" 
E: 10mount: mount: unknown filesystem type 'overlayfs'
E: click-ubuntu-sdk-15.04-i386-2ca427f9-3951-47aa-8d81-fbc67d7a0a6a: Chroot setup failed: stage=setup-start