I asked a question on askubuntu.com. (Upgrade from 16.04 to 18.04 broke apt)
First it was put on hold, because it was too broad. So I edited my question to make it more specific.
Some hours later the question was deleted without any comment.

• I researched half a day before asking the question.
• The English was not the best, but it was ok.
• As far as I perceived it the question was detailed and very specific.

So I can't think of any reason why my question was deleted.
I'd be glad if anyone could help me solving this mystery.