KSMG2.0 installation failure at setup.py [Kaspersky Secure Mail Gateway]

There're only two known errors during KSMG installation. 

First one: 

ksmg.celeryd.service failed because a timeout was exceeded

Above error means that DNS and/or DHCP servers are not accessible.  Please reinstall and make sure that DNS and/or DHCP is configured properly.

Second error:

with error code=1 and msg=initdb: error: directory "/var/opt/kaspersky/ksmg/postgresql" exists but is not empty

if you want to create a new database system, either remove or empty the directory "/var/opt/kaspersky/ksmg/postgresql" or run initdb

with an argument other than "/var/opt/kaspersky/ksmg/postgresql"

To fix the error just delete created VM and create a new one.