Looking at the DpkgTerminalLog, this is the issue:
Setting up ufw (0.23.3) ...
Installing new version of config file /etc/init.d/ufw ...
readlink: invalid option -- 'q'
BusyBox v1.10.2 (Ubuntu 1:1.10.2-1ubuntu6) multi-call binary
Usage: readlink [-f] FILE
Display the value of a symlink
Options:
-f Canonicalize by following all symlinks
ucf: Unable to determine The new file
dpkg: error processing ufw (--configure):
subprocess post-installation script returned error exit status 1
So ucf failed due to a problem with busybox. foomatic-filters failed in
the same way. This is not a ufw bug.
** Package changed: ufw (Ubuntu) => ucf (Ubuntu)
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package ufw 0.23.3 failed to install/upgrade: subprocess post-installation
script returned error exit status 1
https://bugs.launchpad.net/bugs/323227
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