>
> It seemed to be installing now, but when running sage ./start_device.py, I 
> get the following error with ssh:
>

Okay, I am slowly moving forward: I had not installed openssh-server...

Now, I get the following error message:

stumpc5@stumpc5:~/progs/sage-5.0.rc0/devel/sagecell$ sage ./start_device.py
Executing:  /home/stumpc5/progs/sage-5.0.rc0/sage  -python trusted_db.py  
--untrusted-mem -1  --workers 5  --quiet ''  --untrusted-account 
'localhost'  --untrusted-python '/home/stumpc5/progs/sage-5.0.rc0/sage  
-python'  --untrusted-cpu -1 
PID:  22308
/usr/bin/ssh: 
/home/stumpc5/progs/sage-5.0.rc0/local/lib/libcrypto.so.1.0.0: no version 
information available (required by /usr/bin/ssh)
stumpc5@localhost's password: 
SSH process id:  22464
ssh: /home/stumpc5/progs/sage-5.0.rc0/local/lib/libcrypto.so.1.0.0: no 
version information available (required by ssh)
Pseudo-terminal will not be allocated because stdin is not a terminal.
stumpc5@localhost's password: 
Welcome to Ubuntu 12.04 LTS (GNU/Linux 3.2.0-24-generic x86_64)

 * Documentation:  https://help.ubuntu.com/

Traceback (most recent call last):
  File "device_process.py", line 62, in <module>
    sage.all.plot(lambda x: x, (0,1)).save(StringIO.StringIO())
  File 
"/home/stumpc5/progs/sage-5.0.rc0/local/lib/python2.7/site-packages/sage/misc/decorators.py",
 
line 456, in wrapper
    return func(*args, **kwds)
  File 
"/home/stumpc5/progs/sage-5.0.rc0/local/lib/python2.7/site-packages/sage/plot/graphics.py",
 
line 2191, in save
    ext = os.path.splitext(filename)[1].lower()
  File "/home/stumpc5/progs/sage-5.0.rc0/local/lib/python/posixpath.py", 
line 96, in splitext
    return genericpath._splitext(p, sep, altsep, extsep)
  File "/home/stumpc5/progs/sage-5.0.rc0/local/lib/python/genericpath.py", 
line 91, in _splitext
    sepIndex = p.rfind(sep)
AttributeError: StringIO instance has no attribute 'rfind'


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