Thanks for your report.
The cause of the failure is :
====
dpkg: error processing ufw (--configure):
package ufw is already installed and configured
====
Something has probably gone wrong with a previous install.
You can solve this by running the following command:
sudo apt-get install --reinstall ufw
Let us known if this fixes your problem.
** Changed in: ufw (Ubuntu)
Status: New => Incomplete
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package doc-base 0.8.16 failed to install or upgrade
https://bugs.launchpad.net/bugs/298996
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