 @tsimonq2 https://packages.ubuntu.com/cosmic/qtdeclarative5-qtquick2-plugin
 left over transitional from 5.9.5
 $ reverse-depends qtdeclarative5-qtquick2-plugin
 twinkle actually has:
 So that package can be safely dropped.
 :)
 It is listed on https://people.canonical.com/~ubuntu-archive/NBS/ so I hope someone from archive team will clean it up.