Preparing to unpack .../ubuntu-core-launcher_2.23.1_amd64.deb ...
Unpacking ubuntu-core-launcher (2.23.1) over (2.22.6) ...
Preparing to unpack .../snap-confine_2.23.1_amd64.deb ...
Unpacking snap-confine (2.23.1) over (2.22.6) ...
Preparing to unpack .../snapd_2.23.1_amd64.deb ...
Warning: Stopping snapd.service, but it can still be activated by:
  snapd.socket
Unpacking snapd (2.23.1) over (2.22.6) ...
Processing triggers for man-db (2.7.5-1) ...
dpkg: error processing package upstart (--configure):
 package upstart is already installed and configured