Install libhash-flatten-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libhash-flatten-perl
Description:
flatten/unflatten complex data hashes
Hash::Flatten converts back and forth between a nested hash structure and a flat hash of delimited key-value pairs. Useful for protocols that only support key-value pairs (such as CGI and DBMs).
Homepage: https://metacpan.org/release/Hash-Flatten
Version: 1.19-2
Section: universe/perl