Aurora for Audacity Beta, first release of 5 plugins for Audacity

I will ask Simone Campanini to look into your debugging info. My knowledge of the Linux environment is too poor for understanding where the problem comes from.
What I can say is:
1) On other OSs, such as Windows and OSX, a 32 bit program runs smoothly under the 64-bit version of the OS.
2) Your error messages simply indicate to me that you did not install the required libraries, FFTW and libwx_gtk2u. Have you tried to install these libraries from the repositories (wih Apt-Get or Synaptic)?
3) Did you install the 32-bit version of Audacity or the 64-bit version?
4) Why are you using a 64-bit OS? The benchmarks done here at the University did clearly indicate that the 64-bit version of any OS gives advantages only if the computer is equipped with more than 4 Gbytes RAM, configured in dual-channel mode (so, in practice, you need to have 8 Gbytes or more...).

But I leave the final word to Simone, he is the real Linux expert here...