I have removed Google from my Online Accounts. But when I start my computer I am asked for a Google password. The dialog does not show which application is asking. I suppose it is Calendar.
When I start Calendar and go to Calendars in the menu, there are still multiple Google calenders in the list? How do I remove these calendars?
I had the same issue. I was no longer using Evolution anyway so I was able to remove the config files for evolution and when I logged out and back in the accounts were gone. If you still use Evolution that probably won't work for you though. removed ~/.config/evolution/ and ~/.local/share/evolution/
In 18.04.1 it is still enough to make the command