Jan Groenewald <jan <at> aims.ac.za> writes:
> 
> Hi Denny,
> I'm happy to assist with further debugging.
> You can probably still find the deb in /var/cache/apt/archives/ and unpack
it elsewhere with, say, mkdir /tmp/sage; dpkg -x
sagemath-upstream-binary_6.7ppa4_amd64.deb /tmp/sage/
> and cd into that to try run /tmp/sage/usr/bin/sage to find out more.
> Regards,
> Jan
> 

Reproduced on Ubuntu 14.04.2. The same thing happens for the "unpack
elsewhere" method.

Furthermore, it seems that all built-in Python modules are not imported
correctly.

$ sage -n
Traceback (most recent call last):
  File "/usr/lib/sagemath/local/bin/sage-notebook", line 7, in <module>
    import argparse
  File "/usr/lib/sagemath/local/lib/python/argparse.py", line 85, in <module>
    import collections as _collections
  File "/usr/lib/sagemath/local/lib/python/collections.py", line 8, in <module>
    from _collections import deque, defaultdict
ImportError: No module named _collections
$ 
$ 
$ sage -p
Traceback (most recent call last):
  File "/usr/lib/sagemath/local/bin/sage-run", line 4, in <module>
    from subprocess import call
  File "/usr/lib/sagemath/local/lib/python/subprocess.py", line 427, in <module>
    import select
ImportError: No module named select
$ 
$ sage -v
SageMath Version 6.7, Release Date: 2015-05-17
$ 

All the modules that fail to be imported (_struct, _collections and select)
are built-in modules.

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