This doesn't seem to be working for me on Ubuntu 20.04 (and according to a comment on https://askubuntu.com/questions/258219/how-do-i-make-apt-get-install-less-

This doesn't seem to be working for me on Ubuntu 20.04 (and according to a comment on https://askubuntu.com/questions/258219/how-do-i-make-apt-get-install-less-noisy https://askubuntu.com/questions/258219/how-do-i-make-apt-get... it seems like I'm not the only one). If, by chance, you're on Ubuntu 20.04, did you happen to figure out a way to get rid of the rest of `apt-get`'s output?