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Hi there
An instance reachability check indicates that something has gone wrong at the OS layer of your instance that is stopping it from responding to ARP probes designed to monitor reachability. It sounds like your instance is failing to boot because it cannot start a particular service. I suggested that this kind of thing could be caused by an absence of NVIDIA modules. You could try to fix this by launching a rescue instance[1] in the same AZ as your instance, stopping your instance, detaching its root volume and reattaching it to the rescue instance as /dev/svda1. Then, connect to the instance, mount the volume:
$ mount -o nouuid /dev/xvdf1 /mnt
Mount /dev, /run, /proc, and /sys of the rescue instance to the same paths as the newly mounted volume:
$ for m in dev proc run sys; do mount -o bind {,/mnt}/$m; done
Call the chroot function to change into the mount directory:
$ chroot /mnt
Then update your kernel headers and drivers[2]. Once you are done, detach the volume and reattach it back to the original instance. Hopefully, this will have repaired the issue and the instance will boot successfully.
Resources:
How to build rescue instance:
[1]https:https://aws.amazon.com/premiumsupport/knowledge-center/ec2-instance-boot-issues/
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