package squid3 3.3.8-1ubuntu14 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

I had a version of squi, not old though, but i downloaded some config files from somewhere i dont remember, then now i wanted to use pure squid installation, i had to remove the old squid using: (as root) apt-get purge squid
and rm -R /etc/squid3...
which in return removed my downloaded files. Ok, now i tried to re-install squid using : (as root) apt-get install squid. i left for like 15 minutes came back and saw the error. No tools or apps or browser were used in the time between removing and reinstalling squid, i removed and then quickly reinstall, i didnt restart, i didnt use applications or anything before removing squid, not even while installing it. I hope i helped.

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: squid3 3.3.8-1ubuntu14
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
Date: Thu Oct 1 10:29:51 2015
DuplicateSignature: package:squid3:3.3.8-1ubuntu14:subprocess installed post-installation script returned error exit status 2
ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationDate: Installed on 2015-09-14 (16 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
RelatedPackageVersions:
 dpkg 1.17.25ubuntu1
 apt 1.0.9.7ubuntu4
SourcePackage: squid3
Title: package squid3 3.3.8-1ubuntu14 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.squid3.errorpage.css: [deleted]
modified.conffile..etc.squid3.msntauth.conf: [deleted]
modified.conffile..etc.squid3.squid.conf: [deleted]