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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.

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I know that, but that's not what I asked. – Hanno Fietz Oct 28 '10 at 14:19
Can you tell why it's not so I can find another way – Joris Nov 4 '10 at 9:25

Pressing Escape key while the system boots will hide the plymouth splash screen and show you the boot messages.

More information can be found here.

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It does not seem to work on my machine. What's plymouth? – Hanno Fietz Oct 28 '10 at 14:24
Plymouth is the project name for the graphical boot process. What do you see when you press escape? – Richard Holloway Oct 29 '10 at 10:28
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

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