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I have 2 servers, serv1 and serv2. I installed Ubuntu 20.04 on both. Serv2 came almost a year after serv1 and with a CPU that I thought would perform better. But after initial testing it was actually slower. To remove all differences between the 2 servers I decided to clone the NVMe drive of serv1 and install it on serv2 NVMe drive. I used Clonezilla create an image of serv1 and install it on serv2 and it seemed to work.

The issue is when I start serv2 it does not boot into Ubuntu. Even when I select the boot menu the NVMe drive does not show up. If I boot with an Ubuntu Live USB I can mount the drive and see that everything is there. What am I doing wrong? Any help would be greatly appreciated.

TylerM
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1 Answers1

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I can suggest you to do nano [mounted drive location]/etc/fstab in a live CD/USB

And then modifiy the UUID of the mounted partitions there, as :

The GUID UUID and associated label refer to a partition, but not the partition's contents. A new partition on the same disk, or a partition on a new disk will have a new GUID UUID. The same partition could hold one file system one day and another on a different day. It only exists for GPT formatted disks, but not for legacy partitioned disks. There's usually no more utility here than specifying root=/dev/sda1 or root=8:1.

source

As you created a new set of partitions, on a different disk, Ubuntu finds no partitions to mount, and as no OS is loaded, fails silently

You'll need to harvest your disk to find which partition is mounted where (using lsblk) then to find the UUID

After that replace the corresponding string after UUID= on the fstab on each line

and reboot

Nicolas Formichella
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  • So clonezilla changed the UUID of the NVMe drive to match the UUID of the drive on serv1. So fstab matched did not need any changes. – TylerM Jan 04 '21 at 19:23
  • Yes, Clonezilla actually done nothing as UUID is unique to a single hardware partition, when created a partition will have a different UUID (those of s2), and maybe you'll need to change GRUB boot UUID too – Nicolas Formichella Jan 04 '21 at 19:27
  • How would I go about changing GRUB boot UUID? – TylerM Jan 04 '21 at 19:45
  • @TylerM There is an answer that will help you with a nice script https://askubuntu.com/questions/1140273/how-to-change-uuid-in-the-boot-grub-grub-cfg – Nicolas Formichella Jan 04 '21 at 20:14
  • So the UUID in grub.cfg and fstab both match the UUID of the drive... – TylerM Jan 04 '21 at 20:34