Failed to install xcurrency-qt on Linux Mint 17 (based on Ubuntu Trusty). The package has libdb4.8++ in its dependencies while on Trusty there are only 5.1 and 5.3 available (on Ubuntu 12.04 there's only 5.1).
4.8++5.1++5.3++Tried to repack .deb. It installed but failed to run as it was trying to find libdb_cxx-4.8.so. I guess I could've made a symlink but packages should be corrected anyway.
I believe this will get you the dependency you are looking for.
sudo apt-add-repository ppa:bitcoin/bitcoin && sudo apt-get update && sudo apt-get install libdb4.8++