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As @FrédéricC and @vdelecroix suggest, the problem seems to come from the path to your Sage installation containing non-ascii characters.

Indeed, looking at the log file you linked to:

File "/home/andrei/Программы/sage-6.4.1-x86_64-Linux/local/lib/python/posixpath.py", line 80, in join
        path += '/' + b
    exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 13: ordinal not in range(128)

This should probably become a Sage ticket or a Sage Notebook ticket.

Related resource: Python 2.x Unicode documentation.