Snapcraft.io disable Chromium sandbox ! See alternative installation instruction on: https://github.com/Joffreybvn/ungoogled-chromium-snapcraft
Ungoogled Chromium retains the default Chromium experience as closely as possible. Unlike other Chromium forks that have their own visions of a web browser, Ungoogled Chromium is essentially a drop-in replacement for Chromium. It also features tweaks to enhance privacy, control, and transparency.