|   | 1 |  initial version  | 
It seems you should install libgfortran3 package, e.g. by typing:
sudo apt-get install libgfortran3
Please tell us if it works, this is related to trac ticket 8049.
Otherwise you will probably have to compile Sage from source.
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                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.