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Hi,
I have installed python from source in the directory /home/rkommine/software/python2.7.
During installation there are no errors seen.
I have added the below environment variables to my bashrc
export PATH=/home/rkommine/software/python2.7.12/bin:/home/rkommine/software/tcltk8.6.6/bin:$PATH
export LD_LIBBRARY_PATH=/home/rkommine/software/python2.7.12/lib:$LD_LIBBRARY_PATH
rkommine@rubuntu:~/Downloads$ which python2.7
/home/rkommine/software/python2.7.12/bin/python2.7
rkommine@rubuntu:~/Downloads$ python2.7 --version
Python 2.7.12
rkommine@rubuntu:~/Downloads$ which pip2.7
/home/rkommine/software/python2.7.12/bin/pip2.7
But when I execute any command with pip2.7 I am getting the below errors
rkommine@rubuntu:~/Downloads$ pip2.7 --version
Traceback (most recent call last):
 File "/home/rkommine/software/python2.7.12/bin/pip2.7", line 7, in <module>
 from pip import main
 File "/home/rkommine/software/python2.7.12/lib/python2.7/site-packages/pip/__init__.py", line 16, in <module>
 from pip.vcs import git, mercurial, subversion, bazaar # noqa
 File "/home/rkommine/software/python2.7.12/lib/python2.7/site-packages/pip/vcs/subversion.py", line 9, in <module>
 from pip.index import Link
 File "/home/rkommine/software/python2.7.12/lib/python2.7/site-packages/pip/index.py", line 30, in <module>
 from pip.wheel import Wheel, wheel_ext
 File "/home/rkommine/software/python2.7.12/lib/python2.7/site-packages/pip/wheel.py", line 32, in <module>
 from pip import pep425tags
 File "/home/rkommine/software/python2.7.12/lib/python2.7/site-packages/pip/pep425tags.py", line 9, in <module>
 import ctypes
 File "/home/rkommine/software/python2.7.12/lib/python2.7/ctypes/__init__.py", line 7, in <module>
 from _ctypes import Union, Structure, Array
ImportError: /home/rkommine/software/python2.7.12/lib/python2.7/lib-dynload/_ctypes.so: undefined symbol: PyUnicodeUCS2_FromUnicode
rkommine@rubuntu:~/Downloads$ pip2.7 install robotframework
Traceback (most recent call last):
 File "/home/rkommine/software/python2.7.12/bin/pip2.7", line 7, in <module>
 from pip import main
 File "/home/rkommine/software/python2.7.12/lib/python2.7/site-packages/pip/__init__.py", line 16, in <module>
 from pip.vcs import git, mercurial, subversion, bazaar # noqa
 File "/home/rkommine/software/python2.7.12/lib/python2.7/site-packages/pip/vcs/subversion.py", line 9, in <module>
 from pip.index import Link
 File "/home/rkommine/software/python2.7.12/lib/python2.7/site-packages/pip/index.py", line 30, in <module>
 from pip.wheel import Wheel, wheel_ext
 File "/home/rkommine/software/python2.7.12/lib/python2.7/site-packages/pip/wheel.py", line 32, in <module>
 from pip import pep425tags
 File "/home/rkommine/software/python2.7.12/lib/python2.7/site-packages/pip/pep425tags.py", line 9, in <module>
 import ctypes
 File "/home/rkommine/software/python2.7.12/lib/python2.7/ctypes/__init__.py", line 7, in <module>
 from _ctypes import Union, Structure, Array
ImportError: /home/rkommine/software/python2.7.12/lib/python2.7/lib-dynload/_ctypes.so: undefined symbol: PyUnicodeUCS2_FromUnicode
rkommine@rubuntu:~/Downloads$ 
Could you please help to fix this error?
Thanks in advance.

This tracker is for fixing Python and CPython. There are other forums (python-list, StackOverflow, for instance) for help with user errors. I believe that there are people on python-list with experience building on Ubuntu and variants, so I suggest asking there. Include details on exactly how you retrieved the source onto your machine.

PS, for future reference, 'crash' here means hanging or exiting *without* a traceback.

I think there are two different Python installations in your $PATH (the one you compiled with UCS4 and the other one is compiled with UCS2 - probably the system Python)
Anyway, like Terry said, this is out of scope for this tracker.