I had the same issue after today's upgrade.

Reading package lists...
Building dependency tree...
Reading state information...
Calculating upgrade...
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up shorewall (5.0.10-1) ...
Checking using Shorewall 5.0.10...
Processing /etc/shorewall/params ...
Processing /etc/shorewall/shorewall.conf...
Loading Modules...
Checking /etc/shorewall/zones...
Checking /etc/shorewall/interfaces...
Determining Hosts in Zones...
Locating Action Files...
Checking /etc/shorewall/policy...
Running /etc/shorewall/initdone...
Adding Anti-smurf Rules
Adding rules for DHCP
Checking TCP Flags filtering...
Checking Kernel Route Filtering...
Checking Martian Logging...
Checking /etc/shorewall/masq...
Checking MAC Filtration -- Phase 1...
Checking /etc/shorewall/blrules...
Checking /etc/shorewall/rules...
Checking /etc/shorewall/conntrack...
Checking MAC Filtration -- Phase 2...
Applying Policies...
Checking /usr/share/shorewall/action.Drop for chain Drop...
Checking /usr/share/shorewall/action.Broadcast for chain Broadcast...
Checking /etc/shorewall/stoppedrules...
Shorewall configuration verified
Failed to retrieve unit: No such method 'GetUnit'
Failed to restart shorewall.service: No such method 'RestartUnit'
See system logs and 'systemctl status shorewall.service' for details.
shorewall.service couldn't restart.
dpkg: error processing package shorewall (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 shorewall

Dale Schroeder

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