I have a local instance of Odoo running on Ubuntu 20.04.6 LTS from the repository.

h-t-t-p-s://nightly-dot-odoo-dot-com/

(See "Setup of the Debian nightly repository")

The only problem is it is Odoo version 16, and we need version 18.

Is there no version 18 nightly repository for Ubuntu?  

Clicking the "details" link, which is supposed to go to 

h-t-t-p-s://www-dot-odoo-dot-com/documentataion/latestadministration/install/install-dot-html#repository  

results in a 404 not found error.

(Apparently I don't have enough "karma" to post real links.)