That's the 'Esc' key.
If you hit Esc and you see no boot messages still, that's because you're
booting with the 'quiet' kernel option, which is the default option in
Ubuntu by design.
And both the 'quiet' and 'splash' options are configurable so that you
can get the full messages at boot if you don't want the splash screen.
Closing, not a bug in the plymouth package.
** Changed in: plymouth (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1664066
Title:
view boot messages
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