I see what is happening with your nuget. The files you're missing are on mediaportal's myget (https://www.myget.org/feed/mediaportal)
Somehow your system isn't picking up on that
btw a number of your issues are not going to be done (f.e. netframework -> dotnet)
It's just too much work (its far from a straightforward conversion) or too much risk of breaking something
On my end building works more or less ok, and PR's will be accepted if deemed ok.
Not sure if we want to open the issues... seeing that the number of active developers is quite low and we probably...