This fixed it for me:
$ sudo apt-get install chromium-codecs-ffmpeg-extra
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$ apt search chromium|grep codecs|cut -d/ -f1|grep -v ^\ |xargs sudo apt install
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
[sudo] password for jamesward:
Reading package lists... Done
Building dependency tree
Reading state information... Done
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:
chromium-codecs-ffmpeg : Conflicts: chromium-codecs-ffmpeg-extra but 59.0.3071.109-0ubuntu0.17.04.1360 is to be installed
chromium-codecs-ffmpeg-extra : Conflicts: chromium-codecs-ffmpeg but 59.0.3071.109-0ubuntu0.17.04.1360 is to be installed
oxideqt-codecs : Conflicts: oxideqt-codecs-extra but 1.21.5-0ubuntu1 is to be installed
oxideqt-codecs-extra : Conflicts: oxideqt-codecs but 1.21.5-0ubuntu1 is to be installed
E: Unable to correct problems, you have held broken packages.
Is this what you mean? Not working out well.