This plugin requires Google Chrome or Chromium to be installed. It will look in
/usr/bin/chromium-browser
and
/usr/bin/chromium
for a Chromium executable. On Ubuntu this will be satified by the chromium-browser package:
sudo apt install chromium-browser.
This is already installed on the DigitalOcean Marketplace Saltcorn 0.6.0+ droplet.
If these are not found it will default to Puppetter's standard Chromium/Google Chrome search path. For instance, it works on macOS with Chromium installed.