gistfile1.txt

The following extra packages will be installed:
  squid3
Suggested packages:
  squidclient squid-cgi
The following packages will be upgraded:
  squid3
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/1,519 kB of archives.
After this operation, 1,024 B of additional disk space will be used.
Do you want to continue [Y/n]? y
(Reading database ... 445952 files and directories currently installed.)
Preparing to replace squid3 3.1.19-1ubuntu3.12.04.4 (using .../squid3_3.1.19-1ubuntu3.12.04.6_i386.deb) ...
squid3 stop/waiting
cat: /var/run/squid3.pid: No such file or directory
dpkg: error processing /var/cache/apt/archives/squid3_3.1.19-1ubuntu3.12.04.6_i386.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
squid3 start/running, process 3996
Errors were encountered while processing:
 /var/cache/apt/archives/squid3_3.1.19-1ubuntu3.12.04.6_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

$ apt-get purge squid3
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
squid : Depends: squid3 but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

$ dpkg -P squid3
dpkg: dependency problems prevent removal of squid3:
squid depends on squid3.
dpkg: error processing squid3 (--purge):
dependency problems - not removing
Errors were encountered while processing:
squid3

$ apt-get --force-yes remove squid3
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
squid : Depends: squid3 but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).