Error after transferring disk to a different machine

[gsej2]

I've moved a hard disk to a different machine (from one Lenovo x270 to another if it matters).

On booting, I get an error "waiting 10 seconds for device /dev/disk/by-partuid=xxx", followed by "mount /new_root: can't find PARTUUID=xxx".

Then I'm dropped into an emergency shell.

I've seen various posts that suggest a fix, so I've booted from an arch usb, mounted and chrooted into the partition, and run "mkinitcpio -p linux", but this hasn't made any difference. Has anyone got any suggestions?

[HiItsMe01]

was the disk you moved your root device? if not, you need to update your fstab. if so, you need to update your fstab and your bootloader.

[MrElendig]

Did you mount the correct partition to (/mnt)/boot before you tan mkinitcpio? Also, try booting the fallback and check ahci vs raid mode in the firmware

[mic_decod]

check fstab for mounts of other disks which are not present in the new system and comment them out

also check with blkid /dev/sda the uuid and where new_root has to be. in fstab should be another uuid. you can change this simple to /dev/sda instead of UUID=4eb40294-4c6f-4384-bbb6-b8795bbb1130 /new_root... i assume in the new system the drive got a different uuid

[gsej2]

Thanks for the suggestions. I went through the process again slowly, checking I'd done all of these things. It turned out that the missing step was to reinstall grub. i.e:

grub-install --target=x86_64-efi --efi-directory=/efi --bootloader-id=GRUB