pip update error

```
root@ubuntu:~/source/fail2ban# pip list | grep python-apt
python-apt (0.9.3.5ubuntu2)
root@ubuntu:~/source/fail2ban# pip install --upgrade python-apt
Collecting python-apt
Using cached python-apt-0.7.8.tar.bz2
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-build-fPcLQq/python-apt/setup.py", line 11, in
string.split(parse_makefile("python/makefile")["APT_PKG_SRC"]))
File "/usr/lib/python2.7/distutils/sysconfig.py", line 304, in parse_makefile
fp = TextFile(fn, strip_comments=1, skip_blanks=1, join_lines=1)
File "/usr/lib/python2.7/distutils/text_file.py", line 103, in __init__
self.open (filename)
File "/usr/lib/python2.7/distutils/text_file.py", line 120, in open
self.file = open (self.filename, 'r')
IOError: [Errno 2] No such file or directory: 'python/makefile'

----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-fPcLQq/python-apt/
```

how can i solve it?