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I enabled the kernel messages a long time ago because I was playing around with Ubuntu. But now I am finished and I want to disable them again, but forgot how to.

/etc/default/grub already contains the line:

#GRUB_TERMINAL=console

(including the hash which diables it).

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Check if /etc/default/grub has the following line uncommented GRUB_TERMINAL=console. If yes, then open it with sudo gedit /etc/default/grub, add a # in the beginning of that line and save. Do not change anything else. –  AsheeshR Sep 22 '13 at 13:12
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@max: Did you read http://askubuntu.com/questions/248/how-can-i-show-or-hide-boot-messages-when-ub‌​untu-starts ? If you did then mentioning that in the OP might help prevent duplicate answer which did not work for you. If you did not then we can close this as a duplicate question. –  Hennes Sep 22 '13 at 14:13
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2 Answers

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Check if /etc/default/grub has the line GRUB_TERMINAL=console uncommented. Either open it with any editor, or just run this in the terminal:

cat /etc/default/grub | grep GRUB_TERMINAL

If the output is GRUB_TERMINAL=console without a #, then open the file with sudo gedit /etc/default/grub, add a # in the beginning of that line and save. Do not change anything else.

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Was arleady with # –  Max Lange Sep 22 '13 at 13:35
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The GRUB_CMDLINE_LINUX_DEFAULT definition in /etc/default/grub should contain "quiet splash". You also need Plymouth to be installed.

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