title: NO_PUBKEY "4EB27DB2A3B88B8B" for Dart apt repo
body: <p>A while ago I installed the Dart SDK using <a href="https://dart.dev/get-dart#install-using-apt-get" rel="nofollow noreferrer">apt-get</a>, but I noticed recently that <code>apt update</code> was showing an error <code>NO_PUBKEY &quot;4EB27DB2A3B88B8B&quot;</code> and I was unable to update Dart.</p>