Hi Gerard, Gerard ROBIN <[email protected]> writes:
> Hello,
>
> After a recent upgrade, the linux-image-6.19.6+deb14+1-amd64 kernel was
> installed on my Forky laptop, but when I restart my machine, the old kernel,
> linux-image-6.19.6+deb14-amd64, is selected by default. So I have two
> questions:
>
> Q1: Why isn't 6.19.6+deb14+1 selected by default?
> (When I select it manually, it works fine.)
>
This seems to be due to the alphabetic sorting order. Considering the 2
kernel names:
,----[ Notice the place marked by ^ ]
| linux-image-6.19.6+deb14-amd64
| ^
| linux-image-6.19.6+deb14+1-amd64
| ^
`----
The ascii code of '+' is 43, and '-' is 45, so '-' is considered a
bigger value so it's placed in higher precedence.
(I hope the kernel team can find a better naming scheme, as this is
really confusing for most users.)
> Q2: How can I make 6.19.6+deb14+1 the default kernel instead of
> linux-image-6.19.6+deb14-amd64 ?
>
You have a few options:
* Manually select the newer kernel in Grub during boot, and remove the
older kernel, and after that it will use "+deb14+1".
* Change the GRUB_DEFAULT value in `/etc/default/grub'.
- Find which entry the "+deb14+1" kernel is in /boot/grub/grub.cfg and
use the unique ID of that entry in GRUB_DEFAULT. I used the
following command and its output quoted below:
,----[ First line is the command I used ($ is the prompt) ]
| $ sudo grep "Debian" /boot/grub/grub.cfg
| menuentry 'Debian GNU/Linux' --class debian --class gnu-linux --class gnu
--class os $menuentry_id_option
'gnulinux-simple-c381db16-07ef-4cd9-b5c3-1363344ecbe9' {
| submenu 'Advanced options for Debian GNU/Linux' $menuentry_id_option
'gnulinux-advanced-c381db16-07ef-4cd9-b5c3-1363344ecbe9' {
| menuentry 'Debian GNU/Linux, with Linux 6.19.6+deb14-amd64'
--class debian --class gnu-linux --class gnu --class os $menuentry_id_option
'gnulinux-6.19.6+deb14-amd64-advanced-c381db16-07ef-4cd9-b5c3-1363344ecbe9' {
| menuentry 'Debian GNU/Linux, with Linux 6.19.6+deb14-amd64
(recovery mode)' --class debian --class gnu-linux --class gnu --class os
$menuentry_id_option
'gnulinux-6.19.6+deb14-amd64-recovery-c381db16-07ef-4cd9-b5c3-1363344ecbe9' {
| menuentry 'Debian GNU/Linux, with Linux 6.19.6+deb14+1-amd64'
--class debian --class gnu-linux --class gnu --class os $menuentry_id_option
'gnulinux-6.19.6+deb14+1-amd64-advanced-c381db16-07ef-4cd9-b5c3-1363344ecbe9' {
| menuentry 'Debian GNU/Linux, with Linux 6.19.6+deb14+1-amd64
(recovery mode)' --class debian --class gnu-linux --class gnu --class os
$menuentry_id_option
'gnulinux-6.19.6+deb14+1-amd64-recovery-c381db16-07ef-4cd9-b5c3-1363344ecbe9' {
`----
Now this can get a little complicated as the new kernel entry is
nested in a submenu: you need to get the whole path of the unique
IDs, one from the "submenu", and one from the menuentry for
6.19.6+deb14+1-amd64, and use the format
"submenu_unique_id>menuentry_unique_id" (note the double quote is
required). For my case, it's like below:
GRUB_DEFAULT="gnulinux-advanced-c381db16-07ef-4cd9-b5c3-1363344ecbe9>gnulinux-6.19.6+deb14+1-amd64-advanced-c381db16-07ef-4cd9-b5c3-1363344ecbe9"
- Run `sudo update-grub' to let the new grub settings take effect.
After this, you should be using the newer kernel on your next boot.
Once you have the correct kernel, I would suggest that you remove the
older kernel(s), and set GRUB_DEFAULT back to 0, and run `sudo
update-grub' again to update it. Otherwise it will continue to use the
select kernel in future upgrades, which is mostly likely not what you
want.
> Thanks.
--
Regards,
Xiyue Deng
signature.asc
Description: PGP signature
