Thank you for reporting a bug and helping to make Ubuntu better.
Based on https://launchpadlibrarian.net/473334677/DpkgTerminalLog.txt:
Preparing to unpack .../archives/ufw_0.36-6_all.deb ...
Unpacking ufw (0.36-6) over (0.36-5) ...
Setting up ufw (0.36-6) ...
Configuration file '/etc/default/ufw'
==> Modified (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell to examine the situation
The default action is to keep your current version.
*** ufw (Y/I/N/O/D/Z) [default=N] ? dpkg: error processing package ufw
(--configure):
end of file on stdin at conffile prompt
Looking at
https://launchpadlibrarian.net/473334680/modified.conffile..etc.default.ufw.txt
I can see that the file (/etc/default/ufw) is missing the trailing
newline from 0.36-5 (this file is not manipulated by the ufw command).
I can't say why the file on your system was missing the trailing
newline, but since it was, unattended-upgrades (seen in
https://launchpadlibrarian.net/473334676/DpkgHistoryLog.txt) wasn't in a
position to answer the conffile question.
This is not a bug in ufw. To remedy the situation, you should be able to
perform: sudo apt-get -f install.
I also see that the system is running the current development release of
Ubuntu. Unlike stable releases of Ubuntu, it is sometimes easier to
disable unattended-upgrades when using the development release and
instead run apt manually. If you disable it, feel free to re-enable it
once Ubuntu 20.04 is released.
Thanks again!
** Changed in: ufw (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1871261
Title:
package ufw 0.36-6 failed to install/upgrade: end of file on stdin at
conffile prompt
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