Preparing to unpack .../libc-ares2_1.10.0-3ubuntu0.1_amd64.deb ...
Unpacking libc-ares2:amd64 (1.10.0-3ubuntu0.1) ...
Selecting previously unselected package libmosquitto1:amd64.
Preparing to unpack .../libmosquitto1_1.4.8-1ubuntu0.16.04.1_amd64.deb ...
Unpacking libmosquitto1:amd64 (1.4.8-1ubuntu0.16.04.1) ...
Selecting previously unselected package mosquitto-clients.
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Unpacking mosquitto-clients (1.4.8-1ubuntu0.16.04.1) ...
Processing triggers for libc-bin (2.23-0ubuntu7) ...
Processing triggers for man-db (2.7.5-1) ...
dpkg: error processing package grub-pc (--configure):
 package grub-pc is already installed and configured