SSL on ubuntu VM

do you already have a certificate or do you also need to create one?
most certificate issuers have instructions on installing in windows and linux

These will be good starting points (if not even some good guides):
http://work.haufegroup.io/letsencrypt/
https://jessicadeen.com/how-to-manually-setup-a-lets-encrypt-ssl-cert-for-azure-web-app-with-linux/
https://kimsereylam.com/azure/nginx/letsencrypt/2018/12/07/https-with-letsencrypt-and-certbot.html
https://royaljay.com/development/free-ssl-cert-for-azure-web-apps/

Same steps, independent of runtime environment (machine/container/VM).

And... steps will vary depending on your technology stack.

https://www.experts-exchange.com/questions/29178012/Exporting-a-UCC-SSL-to-a-Windows-Apache-Web-Server-and-Configuring-Apache-to-use.html covers the process of generating an initial cert, then setting up an auto renewal CRON job.

https://www.experts-exchange.com/questions/29167303/How-To-Re-direct-all-Traffic-to-WWW-Apache.html provides good info about how to configure your certs.