We would need to read both the lease and the letter to offer a reliable opinion on this.
Go to an attorney for a paid consultation, and bring the documents (free consultations are about hiring the attorney; they're not for giving advice).
Your worst case scenario: The termination notice simply advised you of your right to break the lease, and required you to provide notice to your landlord. In that case, you would be liable for November rent.
Your best case scenario: The termination notice was notice that the landlord was terminating the lease. In that case, you would not be liable for November rent.
Either way, we would need to see your lease and the notice to give a definitive answer.