Невозможно найти пакет libgstreamer0.10-dev в Ubuntu 18.04

Я пытаюсь установить OpenCV4, как описано здесь: https://www.learnopencv.com/install-opencv-4-on-ubuntu-16-04/

Когда я доберусь до

sudo apt -y install libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev

я получил

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package libgstreamer0.10-dev
E: Couldn't find any package by glob 'libgstreamer0.10-dev'
E: Couldn't find any package by regex 'libgstreamer0.10-dev'
E: Unable to locate package libgstreamer-plugins-base0.10-dev
E: Couldn't find any package by glob 'libgstreamer-plugins-base0.10-dev'
E: Couldn't find any package by regex 'libgstreamer-plugins-base0.10-dev'

Я проверил онлайн, и пакеты доступны по адресу https://packages.ubuntu.com/search?keywords=libgstreamer0.10-dev

Я пытался вручную загрузить и установить с

sudo apt install ./libgstreamer0.10-dev_0.10.36-1.5ubuntu1_amd64.deb

Что дает мне

Note, selecting 'libgstreamer0.10-dev' instead of './libgstreamer0.10-dev_0.10.36-1.5ubuntu1_amd64.deb'
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libgstreamer0.10-dev : Depends: libgstreamer0.10-0 (= 0.10.36-1.5ubuntu1) but it is not installable
                        Depends: libglib2.0-dev but it is not installable
                        Depends: libxml2-dev but it is not installable
                        Depends: gir1.2-gstreamer-0.10 (= 0.10.36-1.5ubuntu1) but it is not installable
E: Unable to correct problems, you have held broken packages.

Я новичок в Ubuntu (используется только Manjaro). Я не понимаю, почему apt не может найти пакет, если он находится на сайте.