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I installed Ubuntu 24.04 alongside with Arch linux , now i am not seeing the option to boot into Arch. I have installed both of them on same drive but on different partitions.
lsblk
nvme0n1 259:0 0 476.9G 0 disk
├─nvme0n1p1 259:1 0 1G 0 part /boot/efi
├─nvme0n1p2 259:2 0 175G 0 part
├─nvme0n1p3 259:3 0 150.9G 0 part
└─nvme0n1p4 259:4 0 150G 0 part /
Arch linux is in p2 and Ubuntu is in p4
Last edited by 4shan (2024-09-07 16:32:24)
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Did you let Ubuntu install it's version of GRUB?
You probably just have to enable os-prober with this line in /etc/default/grub in your Ubuntu system:
GRUB_DISABLE_OS_PROBER=false
Then update the configuration (in Ubuntu).
Or run the grub-install command again from Arch to let that system control the configuration but then you would have to either update the Ubuntu configuration every time that kernel is updated or make a custom menuentry that points to the /vmlinuz & /initrd.img symlinks in Ubuntu that always point to the current kernel version.
Last edited by Head_on_a_Stick (2024-09-07 09:54:05)
"The nation-state domesticates the society in the name of capitalism and alienates the community from its natural foundations."
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Did you let Ubuntu install it's version of GRUB?
I did the default installation.
Now can i just remove the partition and reinstall ubuntu without its grub ?
You probably just have to enable os-prober with this line in /etc/default/grub in your Ubuntu system:
so i updated the config and then ran
grub-mkconfig -o /boot/grub/grub.cfg
output:
sudo grub-mkconfig -o /boot/grub/grub.cfg
Sourcing file `/etc/default/grub'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-6.8.0-41-generic
Found initrd image: /boot/initrd.img-6.8.0-41-generic
Found memtest86+ 64bit EFI image: /boot/memtest86+x64.efi
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Adding boot menu entry for UEFI Firmware Settings ...
done
i still not see the arch linux in boot menu
Or run the grub-install command again from Arch to let that system control the configuration but then you would have to either update the Ubuntu configuration every time that kernel is updated or make a custom menuentry that points to the /vmlinuz & /initrd.img symlinks in Ubuntu that always point to the current kernel version.
how do i access the arch linux
Last edited by 4shan (2024-09-07 10:49:39)
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Now can i just remove the partition and reinstall ubuntu without its grub ?
No need for that, even with Ubuntu. You could let Arch take control by running the grub-install command from there but I think it is actually better to keep Ubuntu for the bootloader while you have it installed. Arch is easier to manage as a subsidiary because the kernel & initramfs images are not versioned. Ubuntu & Debian also offer non-versioned symlinks for those images but grub-mkconfig does not take advantage of them.
i still not see the arch linux in boot menu
Was /dev/nvme0n1p1 used by your Arch system? I have no idea if the Ubuntu installer would format the ESP but if it did and you were using that for Arch's /boot/ then Arch's kernel & initramfs would have been wiped, which would mean os-prober wouldn't present an entry for the boot menu.
Check /dev/nvme0n1p2 for /boot/vmlinuz-linux, if that exists then mount that partition in Ubuntu before updaing the configuration again:
# mount /dev/nvme0n1p2 /mnt
# update-grub
how do i access the arch linux
Mount the root partition then use arch-chroot to gain a shell in the system with the API filesystems mounted. I don't think that's the best path here though, for reasons outlined above.
EDIT: the arch-chroot command is supplied by the arch-install-scripts package, which should be available for Ubuntu 24.04.
Last edited by Head_on_a_Stick (2024-09-07 12:11:12)
"The nation-state domesticates the society in the name of capitalism and alienates the community from its natural foundations."
— Democratic Confederalism, Abdullah Öcalan.
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Was /dev/nvme0n1p1 used by your Arch system? I have no idea if the Ubuntu installer would format the ESP but if it did and you were using that for Arch's /boot/ then Arch's kernel & initramfs would have been wiped, which would mean os-prober wouldn't present an entry for the boot menu.
i dont remember , but i think that's the cases. i did the default install of arch using arch-intsall. what should i do you if the ESP files are deleted.
Check /dev/nvme0n1p2 for /boot/vmlinuz-linux, if that exists then mount that partition in Ubuntu before updaing the configuration again:
it is mounted here the files in the root , and i checked the boot folder is empty
drwxr-xr-x 1 root root 50 Jul 8 12:41 ./
drwxr-xr-x 1 root root 254 Sep 5 21:27 ../
drwxr-xr-x 1 root root 142 Jul 8 12:44 '@'/
drwxr-xr-x 1 root root 18 Jul 14 13:33 '@home'/
drwxr-xr-x 1 root root 142 Sep 5 15:10 '@log'/
drwxr-xr-x 1 root root 251562 Sep 5 20:26 '@pkg'/
drwxr-xr-x 1 root root 0 Jul 8 12:41 '@.snapshots'/
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i did the default install of arch using arch-intsall
You should probably share /var/log/archinstall/install.log here then.
what should i do you if the ESP files are deleted
Either (arch-)chroot into the system and re-install the kernel with the Arch system's /boot/ mounted under the ESP or re-install the kernel to the root partition (ie, without /dev/nvme0n1p1 mounted under /boot/ in the Arch system), which I think will be the better option.
So from a normal user shell in Ubuntu:
sudo -i
apt-get install arch-install-scripts # does Ubuntu still use apt-get? I have no idea!
mount -o subvol=@ /dev/nvme0n1p2 /mnt
arch-chroot /mnt /bin/su -
sed -i '/boot/d' /etc/fstab # delete /boot/ line in fstab
mount -a # mount remaining lines in fstab
pacman -Syu linux
exit
update-grub
umount /mnt
apt-get purge arch-install-scripts
exit
EDIT: corrected 1st mount command for subvolume. D'oh!
Last edited by Head_on_a_Stick (2024-09-07 12:55:02)
"The nation-state domesticates the society in the name of capitalism and alienates the community from its natural foundations."
— Democratic Confederalism, Abdullah Öcalan.
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You should probably share /var/log/archinstall/install.log here then.
there are no logs
Either (arch-)chroot into the system and re-install the kernel with the Arch system's /boot/ mounted under the ESP or re-install the kernel to the root partition (ie, without /dev/nvme0n1p1 mounted under /boot/ in the Arch system), which I think will be the better option.
.
So from a normal user shell in Ubuntu:
sudo -i
apt-get install arch-install-scripts # does Ubuntu still use apt-get? I have no idea!
mount -o subvol=@ /dev/nvme0n1p2 /mnt
arch-chroot /mnt /bin/su -
sed -i '/boot/d' /etc/fstab # delete /boot/ line in fstab
mount -a # mount remaining lines in fstab
pacman -Syu linux
exit
update-grub
umount /mnt
apt-get purge arch-install-scripts
exit
EDIT: corrected 1st mount command for subvolume. D'oh!
so i ran the commands here's the output
https://paste.mozilla.org/sjrgEbZc
after that when i reboot is see arch in the boot menu but when i select it i see this error
https://imgur.com/a/OnVs3YU
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Ah yes, silly me — /dev/nvme0n1p2 needs to be mounted plainly so the subvolumes are exposed correctly to grub-mkconfig.
sudo mount /dev/nvme0n1p2 /mnt
sudo update-grub
sudo umount /mnt
"The nation-state domesticates the society in the name of capitalism and alienates the community from its natural foundations."
— Democratic Confederalism, Abdullah Öcalan.
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Ah yes, silly me — /dev/nvme0n1p2 needs to be mounted plainly so the subvolumes are exposed correctly to grub-mkconfig.
sudo mount /dev/nvme0n1p2 /mnt sudo update-grub sudo umount /mnt
now the arch linux option is gone in the boot menu.
i only ran the above 3 command.
do i have chroot again and repeat the process ?
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How about when you run `update-grub` without /dev/nvme0n1p2 mounted at all? I'm not sure how Ubuntu's version works.
Does /dev/nvme0n1p2 contain /@/boot/vmlinuz-linux?
"The nation-state domesticates the society in the name of capitalism and alienates the community from its natural foundations."
— Democratic Confederalism, Abdullah Öcalan.
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How about when you run `update-grub` without /dev/nvme0n1p2 mounted at all? I'm not sure how Ubuntu's version works.
still not detected
Does /dev/nvme0n1p2 contain /@/boot/vmlinuz-linux?
yes
drwxr-xr-x 1 root root [quote=Head_on_a_Stick] 440 Sep 7 10:59 ./
drwxr-xr-x 1 root root 254 Sep 5 21:27 ../
-rw-r--r-- 1 root root 287442 Aug 2 19:15 config-6.8.0-41-generic
drwxr-xr-x 4 root root 4096 Jan 1 1970 efi/
drwxr-xr-x 1 root root 94 Sep 7 18:54 grub/
lrwxrwxrwx 1 root root 27 Sep 5 21:29 initrd.img -> initrd.img-6.8.0-41-generic
-rw-r--r-- 1 root root 70677546 Sep 7 10:59 initrd.img-6.8.0-41-generic
lrwxrwxrwx 1 root root 27 Sep 5 21:29 initrd.img.old -> initrd.img-6.8.0-41-generic
-rw-r--r-- 1 root root 142796 Apr 8 21:12 memtest86+ia32.bin
-rw-r--r-- 1 root root 143872 Apr 8 21:12 memtest86+ia32.efi
-rw-r--r-- 1 root root 147744 Apr 8 21:12 memtest86+x64.bin
-rw-r--r-- 1 root root 148992 Apr 8 21:12 memtest86+x64.efi
-rw------- 1 root root 9058665 Aug 2 19:15 System.map-6.8.0-41-generic
lrwxrwxrwx 1 root root 24 Sep 5 21:29 vmlinuz -> vmlinuz-6.8.0-41-generic
-rw------- 1 root root 14948744 Aug 2 19:39 vmlinuz-6.8.0-41-generic
lrwxrwxrwx 1 root root 24 Sep 5 21:29 vmlinuz.old -> vmlinuz-6.8.0-41-generic
Last edited by 4shan (2024-09-07 13:57:40)
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That looks like an Ubuntu filesystem. I was asking about the (btrfs) filesystem on /dev/nvme0n1p2, which you claimed to be Arch.
"The nation-state domesticates the society in the name of capitalism and alienates the community from its natural foundations."
— Democratic Confederalism, Abdullah Öcalan.
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That looks like an Ubuntu filesystem. I was asking about the (btrfs) filesystem on /dev/nvme0n1p2, which you claimed to be Arch.
Sorry my bad , i didn't CD properly
here's the correct one
drwxr-xr-x 1 root root 120 Sep 7 18:12 ./
drwxr-xr-x 1 root root 142 Jul 8 12:44 ../
-rw------- 1 root root 128396317 Sep 7 18:12 initramfs-linux-fallback.img
-rw------- 1 root root 18241730 Sep 7 18:11 initramfs-linux.img
-rw-r--r-- 1 root root 13406720 Sep 7 18:11 vmlinuz-linux
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So it looks like Ubuntu's os-prober and/or grub-mkconfig can't handle the Arch subvolumes properly.
I think the best approach here is to generate /boot/grub/grub.cfg for the Arch system and use that in Ubuntu's bootloader.
So from Ubuntu (all commands need to be run as root):
mount -o subvol=@ /dev/nvme0n1p2 /mnt
arch-chroot /mnt /bin/su -
mount -a
grub-mkconfig -o /boot/grub/grub.cfg
exit
Then add this to the end of the file at /etc/grub.d/40_custom in Ubuntu:
menuentry 'Arch' {
search --fs-uuid --set=root $uuid
configfile /@/boot/grub/grub.cfg
}
^ Replace $uuid with the actual filesystem UUID for the Arch partition then save the file and run `update-grub` to add it to Ubuntu's boot menu.
Alternatively write your own custom menuentry for Arch that starts it directly without needing grub.cfg in Arch.
"The nation-state domesticates the society in the name of capitalism and alienates the community from its natural foundations."
— Democratic Confederalism, Abdullah Öcalan.
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It worked , now i can access Arch.
Thankyou man for all the help.
Also can you guide me if in future i want to dual boot two linux systems , what should be the standard approach for doing it.
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For dual-booting with Arch it is usually best to let the other distribution control and configure the bootloader, as we have done here.
"The nation-state domesticates the society in the name of capitalism and alienates the community from its natural foundations."
— Democratic Confederalism, Abdullah Öcalan.
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For dual-booting with Arch it is usually best to let the other distribution control and configure the bootloader, as we have done here.
Some machines, e.g. HP or Asrock for instance can check all blocks, bootable or not (bootable ich much better :-) an make list, HP want some escape and then F9, Asrock wants a decision to manage the setup with F2 or decide per F11 wich bootable Block to start. That's not bad and there ist a list to find, which machine uses what a start needs. HP is a bit courous, but works perfekt. It is older. The fact is by that way, whatever you want to boot, you can boot when it is bootable. It is better or not to use a virtual Machine? But that needs GUI. And then you have a real doubleboot. Think about XEN then.
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