I like my machine to boot quietly, if only for aestethic reasons. Sometimes, however, things go wrong, and then I would like to see the boot messages. Can I switch them on during boot, i. e. without rebooting and modifying the GRUB entry?
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if you don't see your grub menu press shift
during a boot.
if you see grub, go to the line/kernel you want to boot.
press e
to edit the config of that kernel.
remove quiet
and press ctrl+x
to boot.

Joris
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I know that, but that's not what I asked. – Hanno Fietz Oct 28 '10 at 14:19
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Can you tell why it's not so I can find another way – Joris Nov 04 '10 at 09:25
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Pressing Escape key while the system boots will hide the plymouth splash screen and show you the boot messages.

Richard Holloway
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Plymouth is the project name for the graphical boot process. http://www.freedesktop.org/wiki/Software/Plymouth. What do you see when you press escape? – Richard Holloway Oct 29 '10 at 10:28
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Nothing happens, it just resumes the boot process and gives me the graphical login screen. I'm using an out-of-the-box Lucid Netbook Remix – Hanno Fietz Oct 29 '10 at 12:34