So this is almost a repeat of the article I wrote earlier Installation Error with JungleDisk on Fedora, This was almost the same issue. Once you download your file located here, simply installing the package will not get JungleDisk running, especially on x86_64 OS's. For some reason some OS like Linux Mint, Jungle Disk does not play nice with the default icons.
What you will need to do is install new icons for your current theme. Simple icons can be found on gnome-look.org. Once you have this installed and changed you have one more step. Just like before you will need to create a symlink of libnotify.
Simply run the following commands:
sudo ln -s /usr/lib/x86_64-linux-gnu/libnotify.so.4 /usr/lib/x86_64-linux-gnu/libnotify.so.1
Once you have libnotify symlinked, run JungleDisk and it should bring you up to create/sign in to your account. Simple as that. I hope this helps you as much as it has helped me.