Dependency issue installing libpq-dev on Ubuntu 11.10

I’m trying to install libpq-dev (PostgreSQL library) on Ubuntu 11.10. When I run apt-get I get the following:

The following packages have unmet dependencies.
libpq-dev : Depends: libkrb5-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

And then when I go to install libkrb5-dev, I get this:

The following packages have unmet dependencies.
 krb5-multidev : Depends: libkrb5-3 (= 1.9.1+dfsg-1ubuntu1) but 1.9.1+dfsg-1ubuntu2.2 is to be installed
                 Depends: libk5crypto3 (= 1.9.1+dfsg-1ubuntu1) but 1.9.1+dfsg-1ubuntu2.2 is to be installed
                 Depends: libgssapi-krb5-2 (= 1.9.1+dfsg-1ubuntu1) but 1.9.1+dfsg-1ubuntu2.2 is to be installed
E: Unable to correct problems, you have held broken packages.

At which point I’m completely lost as it seems like I already have the required packages, but krb5-multidev wants older versions, is that right? How do I work around this?

My answer:

You’ve installed some packages from a newer version of Ubuntu, or from a third party PPA, which conflict with the Ubuntu version you originally installed.

To fix this problem:

Disable the PPA, if there is one.
Check /etc/apt/sources.list and verify that the Ubuntu version being used is the one you want (e.g. lucid, precise, etc.).
Run sudo apt-get update && sudo apt-get dist-upgrade to resync all of your packages to the correct versions. This will both upgrade and downgrade as necessary to get your system back in sync.

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