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Download and install “Sound Converter” (http://soundconverter.berlios.de/).  I just installed the latest from source and it’s working great!.  Download, Extract the compressed the file.

cd to the directory of the uncompressed files

sudo ./configure

sudo make

sudo make install

If you have default ubuntu configuration you also need to run this command for mp3 encoding action:

sudo apt-get install gstreamer0.10-plugins-ugly-multiverse

Browse to Applications-> Sound & Video -> Sound Converter

Change your preferences, add a folder of flac files and convert to compressed!