Just today Dartium is reporting that it is expired and no combination of downloading and re-installing or rebooting or deleting and re-installing resolves the problem. The only solution I have found is to change the Date/Time of my server to yesterday. This is allowing me to function at the moment, but is obviously not a long term solution.
It almost appears to me that the elimination of Dartium as part of Dart2 means that new versions are not being created even though the binaries are expiring. Maybe? Dart2 is not yet considered "stable" and not all pub packages are ready, so it is a bigger job to upgrade than I have time for right now.
Thoughts or Suggestions?
You are not alone https://github.com/dart-lang/sdk/issues/33580
To work around you can use this command to start Dartium
or just set the environment variable in your system