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You have tagged a development release scheduled for release in 2020-April (thus 20.04). Development releases are off-topic on this site until released, refer askubuntu.com/help/on-topic but are supported on IRC or Ubuntu Forums. Did you press <enter> after tapping Y?
Voting to reopen: Although OP tagged the question with +1 release but the question itself isn't really release specific. However, the question can be considered as dupe of How can I run “apt-get install” in the background?