Getting Error on Heroku. Failed to launch chrome
I was having the same issue with puppeteer and Heroku. I installed the same build pack which you have mentioned and i used the following code and now its working fine.
puppeteer.launch({headless: true, args: ['--no-sandbox', '--disable-setuid-sandbox']})
P.S : I deployed again after installing build pack.
Adding this github repo to my heroku buildpack worked for me