Lost access to sites/servers and known good backups won't boot...

I am unable to access some of my servers/sites. When I restore from a known good backup to the existing droplet or new droplets, I see the same error/warning:

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DIGITALOCEAN Droplet Recovery System [17.10.1 (Artful Albacore)]

This system was placed into recovery mode by DigitalOcean support or because the droplet cannot boot due a missing kernel.

• Network access and SSH have been enabled automatically *
• SSH Host keys will NOT match while using this rescue system *

Root Password has been randomly set to: 7459-bc92-d2c4-1056 You are strongly encouraged to use SSH keys.

Select One of the options below:

1. Check Filesystem
2. Reset Droplet Root Password
3. Configure Keyboard
4. Attempt to ‘chroot’ into installed system
5. Interactive Shell [/bin/bash]
6. Install a DigitalOcean provided Ubuntu 16.04 LTS kernel
7. Install/update kernel on disk

Choose (1-7) and press Enter to continue.

I attempted to restore several times using snapshots that have previously worked.

The IP refuses an SSH connection so I used the console and observed a red “fail” message briefly displayed on the screen followed by the message posted above.

I tried the following options with no success at restoring normal use and access.

1. Check Filesystem - passes
2. I am able to chroot into the system and see no issues.
3. Install a DigitalOcean provided Ubuntu 16.04 LTS kernel does not solve it
4. Updating the Kernel does not work.

Why am I unable to use my legacy servers as they were configured?