14.04 - dpkg can't find libicu even though it is installed

I'm trying to install a package using dpkg like this:

sudo dpkg -i mypackage.deb

I get an error:

dpkg: dependency problems prevent configuration of mypackage:
 mypackage depends on libicu42 (>= 4.2-1); however:
  Package libicu42 is not installed.

I already have libicu52 installed on this machine, so I'm not sure why dpkg is giving me this trouble.

I tried to run sudo apt-get install -f to see if that would fix the missing libicu, but that just tried to remove mypackage instead. How can I get dpkg to acknowledge libicu52 as being OK for the dependency of libicu >= 4.2-1?

libicu52 and libicu42 are two distinct packages, therefore no: >=4.2-1 has no effect here.

You can grab the latest version of libicu42 from Lucid (Ubuntu 10.04), but use with care: that package is more than 4 years old, is unmaintained and may contain security bugs.