error when run "OMV-initsystem" command

Dear Sir/Madam
I am trying to install last version of omv Kralizec via web with these code:
1 - echo "deb http://packages.openmediavault.org/public kralizec main" > /etc/apt/sources.list.d/openmediavault.list
2 - apt-get update
3 - apt-get install openmediavault-keyring postfix
4 - apt-get update
5 - apt-get install openmediavault
6 - omv-initsystem
at last step I got this error : "command not found"

how can I solve this issue? Would you please help me?

regards

Thanks for your reply
You can find below the command output:
ii openmediavault 1.9 all open network attached storage olution
ii openmediavault-keyring 0.3 all GnuPG archive keys of the openmediavault archi