[ubuntu-studio-users] Upgrade from 19.04 to 19.10

[BabsKy]

I'm having problems upgrading, I'm getting the message "Please install all
available updates for your release before upgrading.".
I can see that calf-plugins is kept back but have no other updates. I've
run sudo apt-mark unhold calf-plugins but get "calf-plugins was already not
hold", then if I try to upgrade again I get the message "Please install all
available updates for your release before upgrading." again.
I've tried sudo apt-get update && sudo apt-get upgrade.
I don't know what else to try, please help!
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