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Re: Grub menu/MBR modifications

From: Sverker Albatross
Subject: Re: Grub menu/MBR modifications
Date: Tue, 2 Jun 2015 10:03:33 +0200

Thanks guys, sorry for being unclear. I'm not using grub-reboot, and I've certainly haven't done any administrative tasks. The only sudo command in my history is shutdown. This is a production computer.

This is what has happened:
1. Timeout is 10 s like it's always been.
2. Computer is left unattended.
3. Timeout has disappeared.
4. I do grub-install and setup (never can remember which one to use), don't get the expected run through of boot partitions, so I remove an older kernel package.
5. 10 s timeout is back

I've certainly not been messing with boot partitions/records lately so my question is: can this value somehow change by itself? How can I reproduce this phenomenon?

On Tuesday, June 2, 2015, <address@hidden> wrote:
> 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.
> Hi,
> 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,
> ST
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