debconf: unable to initialize frontend: Dialog

When installing a program in Ubuntu 18.04 server minimal installation, i get following error

debconf: unable to initialize frontend: Dialog
debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)
debconf: falling back to frontend: Readline

To fix this, run

apt -y install whiptail

OR

apt -y install dialog

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