can not upgrade youtube-dl on ubuntu

[deng-kai]

I use this command on my ubuntu 14.04 desktop:
sudo -H pip install --upgrade youtube_dl
then this is the result:
Collecting youtube-dl from https://pypi.python.org/packages/2.7/y/youtube_dl/youtube_dl-2015.01.23.4-py2.py3-none-any.whl#md5=88cab49c1d9667a4cacff354376b8d62
Using cached youtube_dl-2015.01.23.4-py2.py3-none-any.whl
Installing collected packages: youtube-dl
Found existing installation: youtube-dl 2015.1.15
Can't uninstall 'youtube-dl'. No files were found to uninstall.
Successfully installed youtube-dl-2015.1.15

/usr/local/lib/python2.7/dist-packages/youtube_dl$ ls
aes.py downloader main.py swfinterp.pyc version.pyc
aes.pyc extractor main.pyc update.py YoutubeDL.py
cache.py init.py options.py update.pyc YoutubeDL.pyc
cache.pyc init.pyc options.pyc utils.py
compat.py jsinterp.py postprocessor utils.pyc
compat.pyc jsinterp.pyc swfinterp.py version.py

command
whereis youtube-dl : /usr/local/bin/youtube-dl

[jaimeMF]

How did you install /usr/local/bin/youtube-dl in the first place?

[deng-kai]

I don't know, and how to fix it.

[jaimeMF]

I guess you installed it with apt, if that's the case run sudo apt-get remove -y youtube-dl, if not you can try removing /usr/local/bin/youtube-dl. Running the pip command after that should work.

[deng-kai]

I was not use apt-get to install youtube-dl. And in /usr/local/lib/python2.7/dist-packages/, youtube_dl folder is existing./usr/local/bin/youtube-dl is an execute file