Issue installing Flatpak on chromeos

Installing on chromeos, I get this error when installing, any help?

Fetched 3,987 kB in 1s (3,383 kB/s)
E: Failed to fetch 404 Not Found [IP: 443]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Did you run apt-get update before running the install command?