Install libconvert-ascii-armour-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libconvert-ascii-armour-perl
Description:
module to convert binary into ASCII-armoured messages
Convert::ASCII::Armour is a Perl module designed to convert hashes of binary octets into ASCII messages suitable for transfer over 6-bit clean transport channels. The encoded ASCII resembles PGP's armoured messages, but are in no way compatible with PGP.
Homepage: http://search.cpan.org/dist/Convert-ASCII-Armour/
Version: 1.4-1
Section: universe/perl