Youtube-dl not working

Have you installed via apt-get? It seems this version is outdated. This was happening to me:

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

You can install it from official sources: https://rg3.github.io/youtube-dl/download.html

Using curl:

sudo curl -L https://yt-dl.org/downloads/latest/youtube-dl -o /usr/local/bin/youtube-dl
sudo chmod a+rx /usr/local/bin/youtube-dl

If you do not have curl, you can alternatively use wget:

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

You can also use pip:

sudo pip install --upgrade youtube_dl

You can also use Homebrew:

brew install youtube-dl

The solutions above didn't work for me. I used the following commands from the official youtube-dl website.

http://rg3.github.io/youtube-dl/download.html

Use wget:

sudo wget https://yt-dl.org/downloads/2014.09.25/youtube-dl -O /usr/local/bin/youtube-dl

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

This fixed it for me.

Those facing new problems with the youtube-dl with this error "Warning: Falling back to static signature algorithm" should first install python-pip (if they have not already installed it, of course) with

sudo apt-get install python-pip

and then, to fix the error, use

sudo pip install youtube-dl --upgrade

This is what worked for me this morning (as at the time of posting this answer).