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I got the following when I tried to update youtube-dl:

amrat@amrat-GA-78LMT-USB3:~$ sudo youtube-dl -U

[sudo] password for amrat: 

It looks like you installed youtube-dl with a package manager, pip, setup.py or a tarball. Please use that to update.

amrat@amrat-GA-78LMT-USB3:~$ 

What does it mean?

I installed the program using the terminal.

I also get this error:

WARNING: unable to set language: <urlopen error [Errno 8] _ssl.c:510: EOF occurred in violation of protocol>

[youtube] ST_WC13rNJo: Downloading webpage

ERROR: Unable to download webpage: <urlopen error [Errno 8] _ssl.c:510: EOF occurred in violation of protocol>

Please advise.

You would be best to remove the Repository youtube-dl which rarely copes with downloading videos or upgrading itself and install instead directly from the developer's website:

sudo apt-get remove youtube-dl

sudo wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/local/bin/youtube-dl

sudo chmod a+rx /usr/local/bin/youtube-dl

And then from time to time update your version with:

sudo youtube-dl -U

Current version reports the following:

andrew@ilium~$ youtube-dl --version

2016.08.01

andrew@ilium~$ 

And this version has no issues with any current YouTube videos and/or playlists that I tested it with...

References:

• youtube-dl: Download

If you installed through a package manager through the terminal, then I'm assuming you used apt.

In that case, try running

sudo apt-get update && sudo apt-get upgrade

to upgrade all installed packages, or use:

apt-get install --only-upgrade youtube-dl

to just upgrade the youtube-dl package.

Let me know if that works.

To fix erorrs while using youtube-dl command, try below fix:

Uninstall youtuble-dl using command : sudo apt-get remove youtube-dl

Install pip using command : sudo apt-get install python-pip

Once done - install youtube-dl : sudo pip install youtube-dl

This worked for me, Hope it does for you as well! :)

It means youtube-dl needs to upgraded by other means than apt or apt-get which use repo or repos which has proven to be outdated.

pip has proven to have the current version youtube-dl which is least likely to fail the download.

try sudo -H pip install -U youtube-dl, should show clean update of youtube-dl in terminal