thanks Steve; but this does not solve my problem. to be more clear this is what i do when i boot: ====== grub> set root=(hd0,gpt4) grub> linux /vmlinuz root=/dev/nvme0n1p4 grub> initrd /initrd.img grub> boot ======
this works; but line #2 can be problematic in some cases. say i'm booting from an external disk backup. then in line 2, i don't know what to set root equal to. if I do: ls /dev then it does not show the various sda1,sdb2,nvme0n1p4; etc etc. the only way i see these is: say i don't set a root=... argument, then the boot FAILS, and i get to BusyBox with an initramfs command line. in this command line, if i do ls /dev THEN i do see the various /dev/nvme0n1p4, etc etc.... but, is there a way to see these in GRUB command line? that way i can know what to set the root arg equal to....... Cheers, Blue ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Monday, May 27, 2019 9:28 PM, Steve <[email protected]> wrote: > type > ls > it will list all partitions and drives > > On Mon, 27 May 2019 at 19:26, Blue Upsilon via Help-grub <[email protected]> > wrote: > >> Hi there, >> >> I use Ubuntu 18.04. >> When I boot from GRUB command line, is there a way to determine what the >> root mounting point will be, before booting? >> >> i.e., say I know that my partition that has Ubuntu is (hd0,gpt4). >> so then I do: set root=(hd0,gpt4) >> and then I happen to know that the correct root mounting point is >> /dev/nvme0n1p4 >> so then I know to do: linux /vmlinuz root=/dev/nvme0n1p4 >> and then i do initrd /initrd.img and boot >> >> but like what if i don't know ahead of time that /dev/nvme0n1p4 is what >> I need? >> (this problem comes up when: say i'm booting from a backup external disk, >> and i don't know whether it will be /dev/sdb2 or whatever.... etc..) >> >> Thanks, >> Blue Upsilon >> _______________________________________________ >> Help-grub mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/help-grub _______________________________________________ Help-grub mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-grub
