Comment 3 for bug 1798795

Ok but do you know if it's not been ported to Cosmic on purpose (and they just forgot to remove it from the ubuntu-restricted-addon recommended packages) or if it's a mistake? If it's on purpose, there's no real point in reporting it.

Anyway, my bug report is a bit of a different case, as the "extra codecs" from the Boutique/Welcome doesn't seem to install ubuntu-restricted-extras but a specific list of packages that you manage (in the Boutique config files or source code). If the problematic package has not been ported to Cosmic on purpose and is removed from ubuntu-resdtricted-extras, the issue will still happen with the Boutique/Welcome.

And as the Boutique wants to specifically install this missing package, I was hoping that you would help report it upstream: as developers of Ubuntu MATE that need it in your software, you'll probably have a bit more weight to have this fixed faster.