Another solutions are:
_ mixing sources in /etc/apt/preferences and /etc/apt/sources.list (but I do no think it is a good idea for Ubuntu)
_ download libhunspell from debian's website:
http://packages.debian.org/search?keywords=libhunspell and install it with dpkg -i
Both those solutions have their problems:
The first is not so simple to configure and you could have strange behavior when trying to do updates. Especially with an Ubuntu distribution mixed with a Debian one... But it works well on Debian.
The second will not allow you to have updates of libhunspell, because it will not be referenced in your sources.list.
Here, I am using the first one and it works perfectly, but I am running Debian.
I just write that for Debian users, because I do not think mixing distribution is a very good thing. And mixing versions might be tricky sometimes.