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I have a problem with the configuration of Grub. I installed Gentoo Linux, then I wanted to support PC-BSD, so I created a dedicated extended partition. I just installed PC-BSD on that partition. When you restart the Grub of PC-BSD, it does not detect my Gentoo. What should I do?

I do not think of being able to hand-edit the grub.cfg. I can start a live GNU/Linux and use chroot to restore the Grub Gentoo and then use proper OS? If you explained to me as well?

Below I give all the relevant details:

PC-BSD grub.cfg

[sorry I have to insert external links because I exceed the number of lines allowed] http://ix.io/1gtf

disk

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  • Do you have os-prober installed (that's what GRUB uses to figure out OSes on partitions/disks). And if so what is its output (needs to be run as root, does not take any parameters).
    – grochmal
    Aug 24, 2016 at 17:43
  • sorry, I did not understand what you mean , I can not actually access the gentoo linux (if not using chroot ) , I think freebsd ( PC-BSD ) has no chroot , what should I do ? thanks for your answer
    – Oscar Andrea Merandi
    Aug 24, 2016 at 19:10
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    You said you do not plan to hand edit grub.cfg therefore you must be using grub-mkconfig, and grub-mkconfig uses os-prober to find which partitions may have a working OS. You need to install a bootloader (or use UEFI, but that is another story) to boot the systems.
    – grochmal
    Aug 24, 2016 at 21:41
  • There is currently installed grub on PC-BSD , the problem is that PC-BSD is not available os - prober to make sure to also detect the gentoo grub
    – Oscar Andrea Merandi
    Aug 25, 2016 at 8:50
  • Ehkm... nope. GRUB is not installed on PC-BSD. GRUB installs itself on the MBR (or EFI) and then points to partitions. From whenever you install GRUB (PC-BSD or Gentoo), does this OS (in chroot or not) has os-prober installed? What does it output?
    – grochmal
    Aug 25, 2016 at 12:13

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