That version is now dead
http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml
** Changed in: privoxy (Ubuntu)
Status: New => Invalid
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Your /etc/privoxy/config above looks very old (copyright 2006) and outdated.
It refers to /etc/privoxy/standard.action and /etc/privoxy/global.action, which
are no longer contained in 3.0.26-3.
So if you upgrade the package and keep the old config without adapting it, this
will always fail.
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1684296
Title:
package privoxy:i386 3.0.26-3 failed to install/upgrade: subprocess
installed post-installation