Web Reference: Aug 11, 2022 · A while ago I installed the Dart SDK using apt-get, but I noticed recently that apt update was showing an error NO_PUBKEY "4EB27DB2A3B88B8B" and I was unable to update Dart. The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4EB27DB2A3B88B8B W: An error occurred during the signature verification. The repository is not... State on 2022.08.28 on jammy: Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
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