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Re: Grub menu/MBR modifications

From: lukshuntim
Subject: Re: Grub menu/MBR modifications
Date: Tue, 02 Jun 2015 12:06:16 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On Tuesday, June 02, 2015 03:02 AM, Andrei Borzenkov wrote:
В Mon, 1 Jun 2015 19:44:04 +0200
Sverker Albatross <address@hidden> пишет:

I have an offline computer (I'm the only user) that's suddenly had its mbr
changed. I had a 10 s timeout, who suddenly has disappeared.  By removing
one older kernel package the timeout is there again. Can anyone explain
what's going on? It's a stripped kubuntu 12.04, offline/unupdated/wifi
disabled since 6 months back.

Would anyone like to explain how/where/when the grub timeout is written?

Some distributions disable timeout if one-time boot menu entry is set
(grub-reboot); and in some cases grub cannot reset it during boot.
Removing kernel likely triggers bootloader reconfiguration which /may/
rewrite grubenv.

There is not really enough information to make a guess.


In ubuntu, there's a configuration file /etc/default/grub that sets the GRUB_TIMEOUT value. Installing/removing a kernel will run update-grub which reads it and create /boot/grub/grub.cfg. You can also run update-grub manually if you change it.

Hope this helps,

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