Re: How to reinstall Grub from Debian

[m josenhans <m_josenhans@web.de>]

Hello Franz,

> You can reinstall grub using grub's own command line tool grub-install
> (see 'man grub-install').

thanks. Reinstallation with 'grub-install /dev/hda' from within Debain 
worked for me fine.

For completness I should mention here that Ubunutu boot menu entry was 
created, however not the Ubunutu recovery boot menu entry.
Would it be worth to file an error report against debian-grub?

> Boot loader installation is something that is done before the reboot
> as part of setting up the base-system; configuring it is a completely
> different subject.

There are also cases, when Debain distribution can no longer be started 
from the boot menu. Reason may be a MBR virus that corrupted Grub from a 
MS Windows partition or e.g. MS Windows installation subsequntly to the 
Debian installation, which replaced Grub in the MBR by directly starting 
MS Windows.

Here a method is needed to reinstall Grub after booting from 
Debian-install-CD.

After booting from install CD, e.g. the Red Hat installer allows 
reinstallation of the boot manager (and doing hard disk partitioning 
with Fdisk) without being required to perform subsequently a full Linux 
installation. So far I've been missing this option in Debian installer...

Br,
Michael


Frans Pop schrieb:
> On Tuesday 29 March 2005 02:46, m_josenhans@web.de wrote:
>
> > + from within Gurb (re)-installation is not possible with 'base-config'
> > tool.
>
>
> You can not and that will not be supported in future. Boot loader 
> installation is something that is done before the reboot as part of 
> setting up the base-system; configuring it is a completely different 
> subject.
>
>
> > +when starting the 'systemtools-> system start' tool (Translated 
> > from german: 'Systemwerkzeuge-> Systemstart'), I get shown the
> > identical grub configuration as it was created by Debian before
> > installation of Ubuntu. This information no longer reflects the current
> > grub configuration nor any change to the confguration shown here does
> > change grubs boot behaviour.
>
>
> This is because you have different /boot directories for each linux 
> installation. Grub uses only one of them, based on the "groot=(hdx,y)" 
> line in /boot/grub/menu.lst when GRUB was installed.
> Currently it is using the one from the Ubuntu installation, not the one 
> from the Debian installation.
>
> What you need is to do is RTFM on how GRUB works.
>
>
> > How can I reinstall grub from my Debian installation?
> > I think even after installation of Debain, 'base-config' should allow
> > reinstallation of Grub. Did I miss anything here?
>
>
> You can reinstall grub using grub's own command line tool grub-install 
> (see 'man grub-install').
>
> Cheers,
> FJP