Mention the yubikey troubleshooting guide for gpg to fix #217

3 years ago · 371d4ec77b
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 - If you receive the error, `gpg: 0x0000000000000000: skipped: Unusable public key` or `encryption failed: Unusable public key` the sub-key may be expired and can no longer be used to encrypt nor sign messages. It can still be used to decrypt and authenticate, however.

+- Refer to Yubico article [Troubleshooting Issues with GPG](https://support.yubico.com/hc/en-us/articles/360013714479-Troubleshooting-Issues-with-GPG) for additional guidance.
+
 # Links

 * https://alexcabal.com/creating-the-perfect-gpg-keypair/