I am using Insync v1.5.2 on Linux Mint 18.3 Cinnamon and getting his error message for over a week now. I think I got an update as well while waiting for this error to go away automatically which did not.
The error reads in the Actions Required is “No permission to add .uuid to fonts” for one of my google account and available options are “Request edit access” or “Retry”. Retry does nothing and request edit access sends an email to that google account but there is no option/way to give whatever access it is asking.
