Public bug reported:
Upgraded to Ubuntu 12.03 to find that squid was replaced by squid3.
Squid has a different config file in /etc/squid3/squid.conf were as the
old Squid was /etc/squid/squid.conf. Tried copying my old squid.conf
overwriting squid3's squid.conf and apparently not compatible. :( I
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https://bugs.launchpad.net/bugs/995861
Title:
package squid3 3.1.19-1ubuntu3 failed to install/upgrade: subprocess
installed post-installation script returned error