In trying to setup development for the Sage Notebook, by following the 
guide at: http://www.sagemath.org/doc/developer/sagenb/index.html , you 
first need to locate the root directory of the Sage installation, SAGE_ROOT 
. Thats the part where im stuck as i dont know where SAGE_ROOT is... Many 
other places make reference to this place, not just the notebook. So kind 
of a general dev issue. Im on ubuntu and have a development directory, just 
containing the sage repository at : ~/sage , and have what is supposed to 
be a non-development working stable installation of sage  that was 
installed using the "UBUNTU PPA" instructions at 
http://www.sagemath.org/download-linux.html, just:

sudo apt-add-repository -y ppa:aims/sagemath
sudo apt-get update
sudo apt-get install sagemath-upstream-binary

Im not sure where this installs to, what the default installation directory 
is on ubuntu, or if sage installs somewhere different? If i do:

user1@computer0:~$ ./sage
bash: ./sage: Is a directory

but but if i do:

user1@computer0:~$ sage
┌────────────────────────────────────────────────────────────────────┐
│ Sage Version 6.3, Release Date: 2014-08-10                         │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
/usr/lib/sagemath/local/lib/python2.7/site-packages/IPython/utils/path.py:
310: UserWarning: IPython dir '/home/user1/.sage/ipython-2.1.0' is not a 
writable location, using a temp directory.
  " using a temp directory."%ipdir)
sage: 

I dont know what the difference between "sage" and "./sage" is, but maybe 
above info will help someone pinpoint where my SAGE_ROOT is? I tried alot 
of searching but no luck so far.


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