ia32-libs won't install unless I also install libgd2-xpm:i386

[Dan Kegel]

On Ubuntu 12.04.1 LTS installed using lxc (i.e. headless), doing
$ sudo apt-get install ia32-libs
fails with
The following packages have unmet dependencies:
 ia32-libs : Depends: ia32-libs-multiarch

$ sudo apt-get install ia32-libs-multiarch
says
The following packages have unmet dependencies:
 ia32-libs-multiarch:i386 : Depends: libgphoto2-2:i386 but it is not going to be installed
                            Depends: libsane:i386 but it is not going to be installed

$ sudo apt-get install libgphoto2-2:i386
says
The following packages have unmet dependencies:
 libgphoto2-2:i386 : Depends: libgd2-xpm:i386 (>= 2.0.36~rc1~dfsg) but it is not going to be installed

And hey presto,
$ sudo apt-get install libgd2-xpm:i386 ia32-libs
says
The following packages will be REMOVED:
  libgd2-noxpm libgraphviz-dev libgvc5 libmagick++-dev libmagickcore-dev libmagickcore4-extra libmagickwand-dev
but works!

(Since my real need was to run the android sdk, I ended up installing a subset instead of the full-on ia32-libs, e.g.
  sudo apt-get install libc6:i386 zlib1g:i386 libstdc++6:i386
but figured I'd mention the workaround here in case it helped others.)

[Steve Langasek (vorlon)]

The libgphoto2-2 dependency on libgd2-xpm is correct; and since libgd2-xpm and libgd2-noxpm conflict, you must have the xpm version of both the i386 and amd64 versions of libgd2. That makes this a bug in graphviz, for preferring the noxpm version of libgd2. We have taken care to enforce libgd2-xpm as the preferred version for all packages on the Ubuntu CD for reasons such as this; that should be extended to other packages as well.