Getting a RSA privkey from the letsencrypt generated pem

@petercooperjr Certbot would ask if it changes the key type:

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An RSA certificate named keytypetest already exists. Do you want to update its
key type to ECDSA?
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(U)pdate key type/(K)eep existing key type: 

Maybe OP pressed "U"?

Pressing "K" results in a RSA key, so no bug in Certbot there.

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