Installing ERROR in Linux Mint 13

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Hi experts!.

Im a new user of LINUX. I installed Linux Mint 13 in my Intel atom N2600 (GMA 3600) Acer Netbook. I download the file 'sage-5.9-linux-32bit-ubuntu_13.04-i686-Linux.tar.lzma'. I followed the next instructions for install SAGE 5.9:

1) GO to download folder in Terminal.
2) tar sage-5.9-linux-32bit-ubuntu_13.04-i686-Linux.tar.lzma
3) sudo mv sage-5.9-linux-32bit-ubuntu_13.04-i686-Linux.tar /usr/local/SAGE
4) ln -s /usr/local/SAGE/sage /sbin/sage

When I type 'sage' i see this:

joseluismietta@joseluisnetbook ~ $ sage
----------------------------------------------------------------------
| Sage Version 5.9, Release Date: 2013-04-30                         |
| Type "notebook()" for the browser-based notebook interface.        |
| Type "help()" for help.                                            |
----------------------------------------------------------------------
The Sage installation tree has moved
from /var/lib/buildbot/build/sage/arando-1/arando_binary/build/sage-5.9
  to /usr/local/SAGE
Updating various hardcoded paths...
(Please wait at most a few minutes.)
DO NOT INTERRUPT THIS.
Done updating paths.
sage:

Thats fine but when i try to plot some graph i receive a ERROR:

sage: var('x')  
x
sage: plot(cos(x),0,1)
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-2-70dec8f1f084> in <module>()
----> 1 plot(cos(x),Integer(0),Integer(1))

/usr/local/SAGE/local/lib/python2.7/site-packages/IPython/core/displayhook.py in __call__(self, result)
    236             self.start_displayhook()
    237             self.write_output_prompt()
--> 238             format_dict = self.compute_format_data(result)
    239             self.write_format_data(format_dict)
    240             self.update_user_ns(result)

/usr/local/SAGE/local/lib/python2.7/site-packages/IPython/core/displayhook.py in compute_format_data(self, result)
    148             MIME type representation of the object.
    149         """
--> 150         return self.shell.display_formatter.format(result)
    151 
    152     def write_format_data(self, format_dict):

/usr/local/SAGE/local/lib/python2.7/site-packages/IPython/core/formatters.py in format(self, obj, include, exclude)
    124                     continue
    125             try:
--> 126                 data = formatter(obj)
    127             except:
    128                 # FIXME: log the exception

/usr/local/SAGE/local/lib/python2.7/site-packages/sage/misc/sage_extension.pyc in __call__(self, obj)
    236         s = format_obj(obj)
    237         if s is None:
--> 238             s = super(SagePlainTextFormatter, self).__call__(obj)
    239         return s
    240 

/usr/local/SAGE/local/lib/python2.7/site-packages/IPython/core/formatters.py in __call__(self, obj)
    445                 type_pprinters=self.type_printers,
    446                 deferred_pprinters=self.deferred_printers)
--> 447             printer.pretty(obj)
    448             printer.flush()
    449             return stream.getvalue()

/usr/local/SAGE/local/lib/python2.7/site-packages/IPython/lib/pretty.py in pretty(self, obj)
    358                             if callable(meth):
    359                                 return meth(obj, self, cycle)
--> 360             return _default_pprint(obj, self, cycle)
    361         finally:
    362             self.end_group()

/usr/local/SAGE/local/lib/python2.7/site-packages/IPython/lib/pretty.py in _default_pprint(obj, p, cycle)
    478     if getattr(klass, '__repr__', None) not in _baseclass_reprs:
    479         # A user-provided repr.
--> 480         p.text(repr(obj))
    481         return
    482     p.begin_group(1, '<')

/usr/local/SAGE/local/lib/python2.7/site-packages/sage/structure/sage_object.so in sage.structure.sage_object.SageObject.__repr__ (sage/structure/sage_object.c:1897)()

/usr/local/SAGE/local/lib/python2.7/site-packages/sage/plot/graphics.pyc in _repr_(self)
    823         """
    824         if SHOW_DEFAULT:
--> 825             self.show()
    826             return ''
    827         else:

/usr/local/SAGE/local/lib/python2.7/site-packages/sage/misc/decorators.pyc in wrapper ...