Login or sign up Lost password?
Login or sign up
For R, there’s a list of mirrors here and all you have to do is edit the The name at the end corresponds to your Ubuntu version. After this you update the list of software by: W: GPG error: xenial/ In Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9 E: The repository ' xenial/ In Release' is not signed.