Unable to Install Postal Mail Server on Ubuntu 20.04

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I am using Digital Ocean VPS, having Ubuntu 20.04.1 and I am trying to build a new SMTP on Postal using Putty (SSH).

When I copy paste the following command to install Postal, it is given me the error (screenshot attached).

Command: curl https://raw.githubusercontent.com/atech/postal/master/script/install/ubuntu1604.sh | sh

Error Screenshot: [Error on using above command]

image
image729×306 11.5 KB

I tried to search the errors solution on internet, but as I am not a programming geek, so I need help about it.

Now, I am stuck here and I want to solve this error so I can have a clean installation of Postal.

Any help would be highly appreciated.

Thank you!