Install xdelta3 and this works, as per this thread. https://forum.snapcraft.io/t/error-generating-delta-delta-tool-path-must-be-set-in-subclass/1280
Install xdelta3 and this works, as per this thread. https:/ /forum. snapcraft. io/t/error- generating- delta-delta- tool-path- must-be- set-in- subclass/ 1280