I am trying to run Sage 5.1 from a computer at work running Debian and it 
crashes right when starts up  ..  


wooly Fri Jul 20:13:26:00 (210) 
~/Src/Devel/SAGE/sage-5.1-linux-64bit-ubuntu_12.04_lts-x86_64-Linux 
$ uname -a
Linux wooly 2.6.32-5-amd64 #1 SMP Sun May 6 05:12:07 UTC 2012 x86_64 
GNU/Linux

wooly Fri Jul 20:13:26:02 (211) 
~/Src/Devel/SAGE/sage-5.1-linux-64bit-ubuntu_12.04_lts-x86_64-Linux 
$ ./sage 
----------------------------------------------------------------------
| Sage Version 5.1, Release Date: 2012-07-09                         |
| Type "notebook()" for the browser-based notebook interface.        |
| Type "help()" for help.                                            |
----------------------------------------------------------------------
'import site' failed; use -v for traceback
Traceback (most recent call last):
  File 
"/usr/home/tnguyen/Src/Devel/SAGE/sage-5.1-linux-64bit-ubuntu_12.04_lts-x86_64-Linux/local/bin/sage-location",
 
line 3, in <module>
    import os, sys
  File 
"/usr/home/tnguyen/Src/Devel/SAGE/sage-5.1-linux-64bit-ubuntu_12.04_lts-x86_64-Linux/local/lib/python/os.py",
 
line 398, in <module>
    import UserDict
  File 
"/usr/home/tnguyen/Src/Devel/SAGE/sage-5.1-linux-64bit-ubuntu_12.04_lts-x86_64-Linux/local/lib/python/UserDict.py",
 
line 84, in <module>
    _abcoll.MutableMapping.register(IterableUserDict)
  File 
"/usr/home/tnguyen/Src/Devel/SAGE/sage-5.1-linux-64bit-ubuntu_12.04_lts-x86_64-Linux/local/lib/python/abc.py",
 
line 109, in register
    if issubclass(subclass, cls):
  File 
"/usr/home/tnguyen/Src/Devel/SAGE/sage-5.1-linux-64bit-ubuntu_12.04_lts-x86_64-Linux/local/lib/python/abc.py",
 
line 184, in __subclasscheck__
    cls._abc_negative_cache.add(subclass)
  File 
"/usr/home/tnguyen/Src/Devel/SAGE/sage-5.1-linux-64bit-ubuntu_12.04_lts-x86_64-Linux/local/lib/python/_weakrefset.py",
 
line 84, in add
    self.data.add(ref(item, self._remove))
TypeError: cannot create weak reference to 'classobj' object
wooly Fri Jul 20:13:26:06 (212) 
~/Src/Devel/SAGE/sage-5.1-linux-64bit-ubuntu_12.04_lts-x86_64-Linux 

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