How to resolve Digital Ocean Ubuntu Droplet Warning Message - System restart required

After creating a new droplet in Digital Ocean, when you log in, you will see the following information:

8 updates can be applied immediately.
1 of these updates is a standard security update.
To see these additional updates run: apt list --upgradable 

*** System restart required ***

If you want to get rid of this message, simply reboot your droplet by typing reboot or sudo reboot.