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I customized a liveUSB of ubuntu, but one package (squid) did not install cleanly so I unsuccessfully tried to uninstall. But everytime I boot up I get a crash warning with the message 

sorry the package "squid3 3.1.16-1ubuntu1~ppa1~lucid1" failed to install or upgrade

What triggers this upgrade attempt and how can I just delete those files manually

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  • Well nothing has worked so far...I still get that error, although I have removed the package via "apt-get purge squid3". There were still left behind files which I deleted manually (like /var/lib/dpkg/info/squid3-common.postinst which is now deleted) yet SOMEWHERE some script is hanging around which results in that error, and I cant find it.
    – user2323932
    Feb 22, 2014 at 22:34

2 Answers 2

Reset to default
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If the apt-get suggestions do not works, try this command:

sudo dpkg --purge --force-all squid3

From the Man page for dpkg:

Force or refuse (no-force and refuse mean the same thing) to do some things. things is a comma separated list of things specified below. --force-help displays a message describing them. Things marked with (*) are forced by default.

          Warning: These options are mostly intended to be used  by
          experts  only.  Using  them  without  fully understanding
          their effects may break your whole system.

          all: Turns on (or off) all force options.
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Remove the package with

sudo apt-get purge squid3

The purge option removes the package and deletes any conf/upgrade files. Use with caution.

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    Sounds like what I need. I'm thinking about your "use with caution" warning though, I can't really think of any harm that can come if it only removes files related to squid3, or am I not thinking though enough?
    – user2323932
    Feb 21, 2014 at 18:31
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    @user2323932 No, but if you point this at heavily configured DHCPd, Apache, Squid, or anything that took a lot of time to craft the conf files, that's what the warning's about.
    – The Dude
    Feb 21, 2014 at 19:15

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