How do I fix this error when running do-release-upgrade?

Logged in to my server via SSH and got a message:

Your Ubuntu release is not supported anymore.
For upgrade information, please visit:

New release '16.04.6 LTS' available.
Run 'do-release-upgrade' to upgrade to it.

When I run it, I get this error

The required dependency 'apt (>=' is not installed. 

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As an important note, I always recommend taking a snapshot of your Droplet before doing a release upgrade in case that anything goes wrong.

Once you’ve done that you could try running the following commands in order to update your apt version:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get -f install
sudo apt-get -y install apt
sudo do-release-upgrade

Hope that this helps! Regards, Bobby