C4pt41nNRex

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                                            C4pt41nNRex

GPG error : The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AA16FCBCA621E701

I think this could solve your problem : ``` sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys AA16FCBCA621E701 ```

GPG error : The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AA16FCBCA621E701

Then, remember to execute: ``` sudo apt-get update ```