I did get insync running once. Set up a sync with one folder on my Google Drive. Then I closed the app and I haven’t been able to get it to start again since.
This is on a pixelbook using the Terminal app, which is Debian stretch.
When I try to start it from the linux prompt with “insync start”, nothing happens at all - I just get the next line’s prompt.
When I try to start it as a ChromeOS app, the icon swirls around and around in the taskbar at the bottom of the screen, but nothing else happens.