A 64 bit installation of Linux needs the 32 bit support libraries installed for some Geneious functionality. If you don't have these installed you may get an error about a missing binary or file. The installation process differs across distributions. To install under Ubuntu 12.04LTS, run the terminal application and run the command 'sudo apt-get install ia32-libs' to install a base set of 32 bit libraries.
If you are using Ubuntu 13.10 through 15.10, you will need to install the following 3 packages instead of ia32-libs: lib32z1, lib32ncurses5, and lib32bz2-1.0. So to install these, run 'sudo apt-get install lib32z1' etc. Ubuntu 16.04 or higher requires libc6-i386, lib32z1, and lib32ncurses5.