@mardy I know, sorry if I'm bothering you but this thing is driving me nuts...I feel this to be the last hurdle before to start helping pro-actively UBports, that's why I'm insisting
Here you go, with the latest output I produced trying to create the OSK container....always complaining about 'dch' missing:

https://paste.ubuntu.com/p/8KTf8TjKVs/

Hope you'll find a clue in here.

Thank you mardy!