It is a dependency for OpenBoard, could someone tell me where to get it please since it is not something that Ubuntu can obtain by itself (I think it's an old version).
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1Related (for some background): https://askubuntu.com/q/1093940/504066 – PerlDuck Nov 18 '18 at 13:16
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1@PerlDuck indeed. I was unsure where to reply, in the end I posted my answer on the other one: https://askubuntu.com/a/1258427/53743. – Immanuel Weihnachten Jul 12 '20 at 10:19
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When the OS is later than Ubuntu 16.04, please add (temporarily) some "xenial" lines to /etc/apt/sources.list :
sudo gedit /etc/apt/sources.list
Lines added, my example :
deb http://dk.archive.ubuntu.com/ubuntu/ xenial main
deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe
deb http://dk.archive.ubuntu.com/ubuntu/ xenial-updates universe
Next : sudo apt update
... And you can then install the package: sudo apt install libavformat-ffmpeg56
- The install test was done OK with Ubuntu 18.04 - amd64.
Knud Larsen
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Install libavformat-ffmpeg56
sudo apt-get install libavformat-ffmpeg56
have been upgraded in Ubuntu 16.10, 17.04, 17.10, 18.04 and 18.10 to libavformat57.
sudo apt-get install libavformat57
slava
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