==== 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.
====

Hi There,

Current installing items as below:
iRedMail version :iRedMail-1.2.1
Deployed with the downloadable installer
Linux/BSD distribution name and version: Ubuntu 18.04.4 LTS
Web server: Nginx

After install thought bash iRedMail.sh

Encountered an error as follows:

Package libclamunrar9 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libclamunrar9' has no installation candidate
<< ERROR >> Installation failed, please check the terminal output.
<< ERROR >> If you're not sure what the problem is, try to get help in iRedMail
<< ERROR >> forum: https://forum.iredmail.org/

I tried to install libclamunrar9, same issued.

sudo apt-get install libclamunrar9
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libclamunrar9 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libclamunrar9' has no installation candidate

Can you help whether i have missed?
Thanks in advance.