In my evaluation, Mnemosyne is the best vocabulary etc. learning application that is available on Linux – see the comparison in my list post on free tools for learning Spanish. But the Ubuntu 12.04 Lucid Lynx archives contain only the 1.2.2 version, while the upcoming 12.10 release will contain the much improved 2.0 version of it [source]. Fortunately, there are no dependency problems at all that hinder us from installing the Ubuntu 12.10 Quantal version on Ubuntu 12.04. Here is how.
Just download the package (of course you can use any mirror from the list):
Install the package "half" (without its dependencies):
sudo dpkg -i mnemosyne_2.0~RC1-3_all.deb
Install all necessary dependency packages from the Ubuntu 12.04 repositories:
sudo apt-get -f install