libavcodec-extra-54 and libavformat54 not upgrading
Solution 1:
According to https://askubuntu.com/a/502208/15003, sudo apt-get install libopus0 followed by sudo apt-get install gstreamer1.0-libav should upgrade the packages that are held back.
Solution 2:
Upgrade them manually
sudo apt install libavcodec-extra-54 libavformat54