```
    File "/usr/lib/python2.7/site.py", line 562, in <module>
main()
    File "/usr/lib/python2.7/site.py", line 544, in main
known_paths = addusersitepackages(known_paths)
    File "/usr/lib/python2.7/site.py", line 271, in addusersitepackages
user_site = getusersitepackages()
    File "/usr/lib/python2.7/site.py", line 246, in getusersitepackages
user_base = getuserbase() # this will also set USER_BASE
    File "/usr/lib/python2.7/site.py", line 236, in getuserbase
USER_BASE = get_config_var('userbase')
    File "/usr/lib/python2.7/sysconfig.py", line 543, in get_config_var
return get_config_vars().get(name)
    File "/usr/lib/python2.7/sysconfig.py", line 442, in get_config_vars
_init_posix(_CONFIG_VARS)
    File "/usr/lib/python2.7/sysconfig.py", line 321, in _init_posix
raise IOError(msg)
IOError: invalid Python installation: unable to open /usr/include/python2.7/pyconfig.h (No such file or directory)

```

I know this is very similair to this [question](https://stackoverflow.com/questions/5345934/problem-running-python-from-crontab-invalid-python-installation) but i'm still not able to solve it

This doesn't really have anything to do with command-not-found error because even when i do remove command-not-found program it still appears.

Also executing the command gives the following output.

```
$ which python
/usr/bin/python
$ python
<gives the same error pasted above>

```

How do i solve it? None of my programs in ubuntu are working.