How to set grub to boot into latest kernel?

macom · 28. Juli 2022

I cannot get grub to boot into the latest kernel. OS filesystem is btrfs

Here the /etc/default/grub

Code

19:38:14 root@hawk:/# cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_TIMEOUT=7
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
GRUB_DISABLE_OS_PROBER=true
GRUB_DISABLE_SUBMENU=y
19:38:18 root@hawk:/#

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after running grub-update I get

Code

19:38:18 root@hawk:/# grep -e "menuentry " -e submenu -e linux /boot/grub/grub.cfg
### BEGIN /etc/grub.d/10_linux ###
set linux_gfx_mode=
export linux_gfx_mode
menuentry 'Debian GNU/Linux, with Linux 5.18.0-0.bpo.1-amd64' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.18.0-0.bpo.1-amd64-advanced-35aa7f57-ee85-4b24-9f11-68fce84034c5' {
    linux    /boot/vmlinuz-5.18.0-0.bpo.1-amd64 root=UUID=35aa7f57-ee85-4b24-9f11-68fce84034c5 ro  quiet
menuentry 'Debian GNU/Linux, with Linux 5.18.0-0.bpo.1-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.18.0-0.bpo.1-amd64-recovery-35aa7f57-ee85-4b24-9f11-68fce84034c5' {
    linux    /boot/vmlinuz-5.18.0-0.bpo.1-amd64 root=UUID=35aa7f57-ee85-4b24-9f11-68fce84034c5 ro single 
menuentry 'Debian GNU/Linux, with Linux 5.16.0-0.bpo.4-amd64' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.16.0-0.bpo.4-amd64-advanced-35aa7f57-ee85-4b24-9f11-68fce84034c5' {
    linux    /boot/vmlinuz-5.16.0-0.bpo.4-amd64 root=UUID=35aa7f57-ee85-4b24-9f11-68fce84034c5 ro  quiet
menuentry 'Debian GNU/Linux, with Linux 5.16.0-0.bpo.4-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.16.0-0.bpo.4-amd64-recovery-35aa7f57-ee85-4b24-9f11-68fce84034c5' {
    linux    /boot/vmlinuz-5.16.0-0.bpo.4-amd64 root=UUID=35aa7f57-ee85-4b24-9f11-68fce84034c5 ro single 
menuentry 'Debian GNU/Linux, with Linux 5.10.0-0.bpo.7-amd64' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.10.0-0.bpo.7-amd64-advanced-35aa7f57-ee85-4b24-9f11-68fce84034c5' {
    linux    /boot/vmlinuz-5.10.0-0.bpo.7-amd64 root=UUID=35aa7f57-ee85-4b24-9f11-68fce84034c5 ro  quiet
menuentry 'Debian GNU/Linux, with Linux 5.10.0-0.bpo.7-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.10.0-0.bpo.7-amd64-recovery-35aa7f57-ee85-4b24-9f11-68fce84034c5' {
    linux    /boot/vmlinuz-5.10.0-0.bpo.7-amd64 root=UUID=35aa7f57-ee85-4b24-9f11-68fce84034c5 ro single 
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
19:41:20 root@hawk:/#

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but after reboot I still get the 5.16 kernel

Code

19:41:20 root@hawk:/# uname -a
Linux hawk 5.16.0-0.bpo.4-amd64 #1 SMP PREEMPT Debian 5.16.12-1~bpo11+1 (2022-03-08) x86_64 GNU/Linux
19:42:05 root@hawk:/#

Before that I tried to set the latest kernel by the kernel plugin, but that did not change anything either.

Thanks for ideas

ryecoaaron · 28. Juli 2022

Do you have grub installed on more than one drive? You could also just remove the 5.16 kernel. apt-get will warn you but you can still do it.

macom · 28. Juli 2022

Zitat von ryecoaaron

Do you have grub installed on more than one drive?

Yes, I have still the previous OS drive in the system.

macom · 28. Juli 2022

But all the UUID belong to the current boot drive.

ryecoaaron · 28. Juli 2022

I just think update-grub might be writing to the wrong drive.

macom · 28. Juli 2022

/boot/grub/grub.cfg

on the old drive is just showing the 5.16 and 5.10 kernel

but maybe it is booting from the old drive. When moving to the new drive I cloned with clonezilla and changed the UUID of the old boot filesystem. So the entry in grub.cfg on the old drive is pointing at the new drive.

Will attach a monitor and check.

Thank

ryecoaaron · 28. Juli 2022

changing the uuid won't change anything with the bios choosing which drive to boot from.

macom · 28. Juli 2022

Yep, that is what I thought. Now connected a monitor. Weird thing is, that the boot menu showed two options. The current drive (USB thumb drive) and another drive, which is a data drive as first option. I now disabled the data drive (no grub installed there), so that only the USB drive is left. Now it booted into the latest kernel.

Do not fully understand what happened, but at least it is booting now correctly. Maybe spend some time to investigate at the weekend.

Thank you for the help.

How to set grub to boot into latest kernel?

macom 28. Juli 2022

macom 28. Juli 2022

Jetzt mitmachen!