==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.7
- Deployed with iRedMail Easy or the downloadable installer? Yes
- Linux/BSD distribution name and version:  Ubuntu
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  Mysql
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I am trying to install iredmail on my local ubuntu machine and I am receiving the following error :

Reading state information...
Package zoo 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

Package php-mcrypt is a virtual package provided by:
  php7.1-mcrypt 7.1.30-1+ubuntu18.04.1+deb.sury.org+1
  php7.0-mcrypt 7.0.33-8+ubuntu18.04.1+deb.sury.org+1
  php5.6-mcrypt 5.6.40-8+ubuntu18.04.1+deb.sury.org+1

E: Package 'php-mcrypt' has no installation candidate
E: Package 'zoo' 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: http://www.iredmail.org/forum/