Manual bench install error - what's this no Ruby required?

[imllc]

not sure what you are suggesting here is a post I found do we need ruby-active-model-serializers or not?

Command 'bench' not found

Hi, I am doing manual installation in Ubuntu 18.10 and getting following error while running “bench” command. Command 'bench' not found, but can be installed with: sudo apt install ruby-active-model-serializers Same error also getting in Ubuntu 18.04.