The head of the youtube-dl script has
#!/usr/bin/env python, meaning that it uses the "python" command.
Distributions can choose include the python command linked to python2 or python3, not include the command at all, or allow the user/admin to configure it.
In debian-based installs, there are 3 main python packages:
- python (
sudo apt install python)
- python2 (
sudo apt install python2)
- python3 (
sudo apt install python3)
The "python" package installs python version 2 and includes the "python" command (symlink /usr/bin/python -> /usr/bin/python2).
The "python2" and "python3" packages do not provide the "python" command.
This means that calling "python" from the CLI or a script will result in a "command not found" error.
If you're using these, you have to either:
- call the script using whichever version you like (
python2 /usr/local/bin/youtube-dl or
python3 /usr/local/bin/youtube-dl) [Personally, I have
alias youtube-dl='python3 /usr/local/bin/youtube-dl' in my .bash_aliases]
- edit the youtube-dl script to use python2 or python3 (
sudo sed -i '1s/python/python2/' /usr/local/bin/youtube-dl) or (
sudo sed -i '1s/python/python3/' /usr/local/bin/youtube-dl)
In the above, I prefer using the aliasing option since you leave the file alone and don't have to edit it every time the file gets updated
It's also possible to fix it by creating a symlink for /usr/bin/python, but that is not adviseable.