Using Ubuntu Focal 20.04 I receive the following error:
9:20:23 AM: LH:ChromeLauncher Waiting for browser… +502ms
9:20:24 AM: LH:ChromeLauncher Waiting for browser… +502ms
9:20:24 AM: LH:ChromeLauncher Waiting for browser… +502ms
9:20:25 AM: LH:ChromeLauncher Waiting for browser… +502ms
9:20:25 AM: LH:ChromeLauncher Waiting for browser… +501ms
9:20:25 AM: LH:ChromeLauncher:error connect ECONNREFUSED 127.0.0.1:37539 +2ms
9:20:25 AM: LH:ChromeLauncher:error Logging contents of /tmp/lighthouse.H8FWW5N/chrome-err.log +0ms
9:20:25 AM: LH:ChromeLauncher:error /opt/build/repo/node_modules/puppeteer/.local-chromium/linux-901912/chrome-linux/chrome: error while loading shared libraries: libgbm.so.1: cannot open shared object file: No such file or directory
9:20:25 AM: LH:ChromeLauncher:error +0ms
If I use the Ubuntu Xenial 16.04 image then it is successful.