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

error message:
********* ERROR *********
Release version of the operating system on this server is unsupported by
iRedMail, please access below link to get the latest iRedMail and a list
of supported Linux/BSD distributions and release versions.

http://www.iredmail.org/download.html

*************************

Ubuntu version 21.04
Gnome 3.38.5
Window manager: Wayland

I tried several times. No chance to start running the installer

All packages just upgraded/updated.

What is the reason? Its really not compatible to the system?