Closes #3616. Document revoked key error when upgrading on Debian.

doc/release-notes.md

@@ -4,3 +4,26 @@ release-notes at release time)
 Notable changes
 ===============
 
+Other issues
+============
+
+Revoked key error when upgrading on Debian
+------------------------------------------
+
+If you see the following error when updating to a new version of zcashd:
+
+`The following signatures were invalid: REVKEYSIG AEFD26F966E279CD`
+
+Remove the key marked as revoked:
+
+`sudo apt-key del AEFD26F966E279CD`
+
+Then retrieve the updated key:
+
+`wget -qO - https://apt.z.cash/zcash.asc | sudo apt-key add -`
+
+Then update the package lists:
+
+`sudo apt-get update`
+
+[Issue](https://github.com/zcash/zcash/issues/3612)