==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.6.0 MariaDB edition.
- Deployed with iRedMail Easy or the downloadable installer? downloaded installer
- Linux/BSD distribution name and version:        Ubuntu 20.04.5 LTS - focal
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx):  Nginx
- Manage mail accounts with iRedAdmin-Pro?  nope
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hi all. I have an Ubuntu 20.04 installed one year ago, regularly updated.
php -v  displays PHP 7.4.3
I always followed upgrade tutorials, but never read instructions to update PHP to version 8.

Now, last version of roundcube need it, but some issues are still not solved.

The question is:  when will it be safe to upgrade PHP to version 8?
and, will it be mentioned in upgrade tutorials, to run it in the safest possible way?

Thanks.