Thanks for reporting this. According to your log, the problem is:
error: gpg required but not found!
Can you check if you have gpg properly installed?
** Changed in: spamassassin (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1259641
Title:
package spamassassin 3.3.2-6ubuntu2 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 2
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