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Re: How-to question - limiting the number of kernels for each OS display

From: Andrei Borzenkov
Subject: Re: How-to question - limiting the number of kernels for each OS displayed in boot menu
Date: Fri, 29 May 2015 22:05:20 +0300

В Sat, 30 May 2015 02:40:39 +0800
Bret Busby <address@hidden> пишет:

> Hello.
> I have a system where, in using the Legacy boot method, I at present
> have Debian 7 and Debian 6 LTS and Ubuntu 14.04 LTS, installed.
> When I boot the system, in the GRUB menu to select which operating
> system to boot, I get more than one screen of options, as, for the
> Ubuntu options, more than 10 lines of (presumably different kernel
> versions) options to boot into Ubuntu, are displayed, and so, being
> the last operating system installed, I have to go to a second screen,
> to get to the option to boot into Debian 6 LTS.

Upstream GRUB by default creates two lines for each OS - one with
default (presumably most recent) kernel and one with submenu for all
other kernels or kernel options. If you get something else, you really
need to ask your distribution how to tune it.

> I also want to try to install Ubuntu 12.04 LTS on the system, and to
> have the option to boot into that, in order to try to discover
> something.
> from memory, a method used to be available, to configure GRUB, so
> that, in the boot menu, no more than the last <x> number of kernel
> versions, would be displyed (for example, no more than the last three
> kernel versions would be displayed in the boot menu, for each
> operating system found and listed).
> I have viewed the manual  published at
> but I can not (easily) find how to achieve the configuration of the
> GRUB boot menu, so as to limit the number of kernel versions for each
> operating system, to be displayed in the GRUB boot menu.
> I want to limit the number of kernel versions to be listed for each
> operating system displayed, to be for only the three last kernel
> versions, for each operating system.
> If this can still be done in GRUB, please tell me how to do it,
> stepwise, as I am apparently, relatively simple.
> Thank you in anticipation.

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