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The Maintenance card says…

Every message the Maintenance card can show instead of working, and what to do.

Chapter 17 of 201 min read
The card saysWhat to do
"This distro isn't installed yet, so there's no disk to check or repair."Nothing to maintain yet.
"Checking what's available…"Wait a moment.
"MSL's background service isn't answering…"See The service isn't running.
"…answered, but not in a way this version understands…"An older service is still running. Log out and back in.
"e2fsck isn't installed…"Copy Install Command, then run it in Terminal.
"Shut the instance down first…"Stop it. See the note on Shut Down.
"This instance has a hibernated session…"Start it, then shut it down, then try again.
"Maintenance is already running on this disk."Wait for it to finish.
"Start the instance to use these."The utilities run inside Linux.
"MSL's background service didn't answer in time. It may still be working — check again in a moment."A long job may still be running. Wait, then check again.