In development we're testing against MariaDB v10.4.27 but it should work just fine on the latest MariaDB LTS (currently 10.6, all of this is equivalent to MySQL8). We do not test against release candidates or alpha/beta releases.

You will want to run on the latest PHP7 build available to you until UBB.threads v8 is released. The newer the build the faster PHP scripts will process.

I am a Web Development Contractor, I do not work for UBBCentral. I have provided free User to User Support since the beginning of these support forums.
Do you need Forum Install or Upgrade Services?
Forums: A Gardeners Forum, Scouters World
UBB.threads: UBBWiki, UBB Styles, UBB.Sitemaps
Longtime Supporter & Resident Post-A-Holic
VNC Web Services: Code Modifications, Upgrades, Styling, Coding Services, Disaster Recovery, and more!