yt-dlp: Unresolved dependency

[Pratham Patel]

Installing/upgrading `yt-dlp` does not install a necessary dependency (`python3-brotli`).

Output of `lsb_release -rd`:
```
Description: Ubuntu 20.04.4 LTS
Release: 20.04
```

Output of `apt-cache policy yt-dlp`
```
yt-dlp:
  Installed: 2022.03.08.1-1~bpo20.04.1
  Candidate: 2022.03.08.1-1~bpo20.04.1
  Version table:
 *** 2022.03.08.1-1~bpo20.04.1 100
        100 http://ports.ubuntu.com/ubuntu-ports focal-backports/universe arm64 Packages
        100 /var/lib/dpkg/status
```

When trying to download media using `yt-dlp`, it gives out an error indicating that an exception occurred because a necessary dependency was not found in the system. The error message is as below:
```
Traceback (most recent call last):
  File "/usr/bin/yt-dlp", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3254, in <module>
    def _initialize_master_working_set():
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3237, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3266, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 584, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 901, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 787, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'brotli' distribution was not found and is required by yt-dlp
```

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Launchpad Janitor (janitor)]

This bug was fixed in the package yt-dlp - 2022.04.08-1

---------------
yt-dlp (2022.04.08-1) unstable; urgency=medium

  * New upstream version 2022.04.08.
    - Refresh supported sites.
    - Refresh patch.
  * d/control: Require dh-python 5.20211213 for 'environment marker' support.
    (LP: #1967266)

 -- Unit 193 <email address hidden> Sat, 09 Apr 2022 00:56:04 -0400

[Jonathan Hunter (jmhunter)]

For anyone on Focal where the current yt-dlp package seems to be 2022.03.08.1-1~bpo20.04.1, you can manually install the "python3-brotli" package to resolve this error.

(You may then also run into LP: #2008009 - https://bugs.launchpad.net/bugs/2008009 - if that has not yet been fixed, also)