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everything was working fine and ubuntu was booting without a flash drive on my macbook pro, and now all of a sudden when I try to boot I get to this grub menu:https://www.linux.com/learn/how-rescue-non-booting-grub-2-linux

I tried following the directions on this page, but right away I ran into a problem. When I type in "1s" to see my partitions, I get "error: can't find command `1s'.

I know it would probably be useful if I provided my grub version, but all I can tell you is "GNU GRUB version 2.02~beta2-29...". The rest is covered by a broken part on my screen, so if that is needed hopefully there is another way I could get that information.

Here is a previous question of mine, which might be relevent: Error: cannot find a GRUB drive

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How did it stop working? Did you change any bios conf? Added removed or changed the order of any disks? what the command lsmod gives? and insmod normal? ls comes from a grub module usually at /boot/grub/x86_64-efi/ls.mod (x86_64-efi depends on your arch).

When booting grub try to load the "normal" module and if it fails it will go to rescue (that is what happened to you). Did it print any errors on boot?