libopencv-dev : The ppa:jonathonf/ffmpeg4 has been removed.

[local-dev-31]

Trying to execute the shell scripts on a bionic 18.04 Ubuntu, I got a 403 Forbidden [IP: 91.189.95.83 80] error :

The following NEW packages will be installed:
  gir1.2-gtk-2.0 libavcodec-dev libavformat-dev libavutil-dev libcv-dev
  libcvaux-dev libgtk2.0-dev libgtkglext1 libhighgui-dev libilmbase-dev
  libjasper-dev libjasper1 libopencv-calib3d-dev libopencv-calib3d2.4v5
  libopencv-contrib-dev libopencv-contrib2.4v5 libopencv-core-dev
  libopencv-core2.4v5 libopencv-dev libopencv-features2d-dev
  libopencv-features2d2.4v5 libopencv-flann-dev libopencv-flann2.4v5
  libopencv-gpu-dev libopencv-gpu2.4v5 libopencv-highgui-dev
  libopencv-highgui2.4v5 libopencv-imgproc-dev libopencv-imgproc2.4v5
  libopencv-legacy-dev libopencv-legacy2.4v5 libopencv-ml-dev
  libopencv-ml2.4v5 libopencv-nonfree2.4v5 libopencv-objdetect-dev
  libopencv-objdetect2.4v5 libopencv-ocl-dev libopencv-ocl2.4v5
  libopencv-photo-dev libopencv-photo2.4v5 libopencv-stitching-dev
  libopencv-stitching2.4v5 libopencv-superres-dev
  libopencv-superres2.4v5 libopencv-ts-dev libopencv-ts2.4v5
  libopencv-video-dev libopencv-video2.4v5 libopencv-videostab-dev
  libopencv-videostab2.4v5 libopencv2.4-java libopencv2.4-jni
  libopenexr-dev libpangox-1.0-0 libswresample-dev libswscale-dev
  libxml2-utils opencv-data
0 upgraded, 58 newly installed, 0 to remove and 0 not upgraded.
Need to get 7,286 kB/23.9 MB of archives.
After this operation, 122 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Err:1 http://ppa.launchpad.net/jonathonf/ffmpeg-4/ubuntu bionic/main amd64 libavutil-dev amd64 7:4.2.1-0york0~18.04.1
  403  Forbidden [IP: 91.189.95.83 80]
Err:2 http://ppa.launchpad.net/jonathonf/ffmpeg-4/ubuntu bionic/main amd64 libswresample-dev amd64 7:4.2.1-0york0~18.04.1
  403  Forbidden [IP: 91.189.95.83 80]
Err:3 http://ppa.launchpad.net/jonathonf/ffmpeg-4/ubuntu bionic/main amd64 libavcodec-dev amd64 7:4.2.1-0york0~18.04.1
  403  Forbidden [IP: 91.189.95.83 80]
Err:4 http://ppa.launchpad.net/jonathonf/ffmpeg-4/ubuntu bionic/main amd64 libavformat-dev amd64 7:4.2.1-0york0~18.04.1
  403  Forbidden [IP: 91.189.95.83 80]
Err:5 http://ppa.launchpad.net/jonathonf/ffmpeg-4/ubuntu bionic/main amd64 libswscale-dev amd64 7:4.2.1-0york0~18.04.1
  403  Forbidden [IP: 91.189.95.83 80]
E: Failed to fetch http://ppa.launchpad.net/jonathonf/ffmpeg-4/ubuntu/pool/main/f/ffmpeg/libavutil-dev_4.2.1-0york0~18.04.1_amd64.deb  403  Forbidden [IP: 91.189.95.83 80]
E: Failed to fetch
...

After a few hours of struggle, found out that The ppa:jonathonf/ffmpeg4 has been removed by its author.

See https://launchpad.net/~jonathonf/+archive/ubuntu/ffmpeg-4

This PPA has been removed from public access as part of a protest against the abuse of open-source projects by large companies. For more detail visit the main page here: https://launchpad.net/~jonathonf

Is there any alternative, or a way around this problem.

Thanks.