Comment 3 for bug 1821403

chromium-browser requires a newer version of libnss3 than what was initially installed. This is not a bug in chromium or libnss itself. A half-updated system is in an inconstistent state, and will result in undefined behaviours like this crash.

If you had run "sudo apt-get dist-upgrade" before "sudo apt-get install -y chromium-browser", this would have avoided the problem.