Why is What is the scope of a public key added by apt-key? closed? Please clarify the stated reason. (see my comments to the reply below for more information)
I closed your question because it was brought to my attention, by another user, that the question has been cross posted on AskUbuntu: https://askubuntu.com/questions/1222590/what-is-the-scope-of-a-public-key-added-by-apt-key
Cross-posting is generally not permitted, see Is cross-posting a question on multiple Stack Exchange sites permitted if the question is on-topic for each site?