I have no idea how to sync my iCloud calendar with gmail calendar. I keep getting two claendars, and the one under iCloud Home does not show up in gmail.
You can't sync an iCloud calendar with Gmail, you can view an iCloud calendar on Gmail's calendar service if you like, but they don't sync.
So I deleted iCloud. Now I try to download calendars to my iCal and I get "Failed."
Did you enter your Gmail account at Mail, Contacts and Calendars (In System Preferences), if not how did you enter it.
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