On dinsdag 2 maart 2021 10:24:41 CET you wrote: > I have a 'server' with no keyboard or monitor attached. I want to > boot into a 5.9 kernel instead of a 5.10 kernel to see whether there's a > NFS problem with 5.10. > But regardless what I specify as GRUB_DEFAULT in /etc/default/grub, it > always boots the top entry. > > I've tried the following things: > - Use the value following "$menuentry_id_option" > - Placed single quotes around previous value > - Placed double quotes around previous value > - Replace "$menuentry_id_option" with "--id" in case it was incorrectly > not expanded/replaced in the grub entries > - Use a numerical value > > None of which resulted in grub booting anything other then the top > entry.
There was one option that I hadn't tried: using the title. When I did that and run 'update-grub' I got an interesting warning: Warning: Please don't use old title `Debian GNU/Linux, with Linux 5.9.0-5- amd64' for GRUB_DEFAULT, use `Advanced options for Debian GNU/Linux>Debian GNU/Linux, with Linux 5.9.0-5-amd64' (for versions before 2.00) or `gnulinux- advanced-2f82ed85-9840-4338-a5b2-71c735333ed9>gnulinux-5.9.0-5-amd64- advanced-2f82ed85-9840-4338-a5b2-71c735333ed9' (for 2.00 or later) So I changed GRUB_DEFAULT to the (latter) value suggested by the warning ... and low-and-behold, that worked! So my compliments for that excellent warning/error message. > If this can't be fixed, can then at least the documentation be updated > to say that grub only works interactively? I would say that the documentation really does need to be updated as what's described in "info -f grub -n 'Simple configuration'" is not/no longer correct. I would've expected an ID to be unique though ... Cheers, Diederik
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