Comment 4 for bug 378898

Well, you can remove the hydr0g3n repository from your sources.list since you're using jaunty. This will correct the invalid key problem.

Regarding the following error:
qbittorrent: error while loading shared libraries: libtorrent-rasterbar.so.2: cannot open shared

Could you make sure libtorrent-rasterbar is actually installed?
sudo apt-get install libtorrent-rasterbar