Se eseguendo questo comando

$ apt update

Viene generato il seguente errore

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: jessie InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B188E2B695BD4743
W: Failed to fetch
W: Some index files failed to download. They have been ignored, or old ones used instead.

Procedere come segue

$ sudo wget -O /etc/apt/trusted.gpg.d/php.gpg

Dovrebbe risolversi generando questo output

--2019-03-18 22:22:18--
Resolving ( 2001:bc8:27d0:300::1,
Connecting to (|2001:bc8:27d0:300::1|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1769 (1.7K) [application/octet-stream]
Saving to: ‘/etc/apt/trusted.gpg.d/php.gpg’

/etc/apt/trusted.gpg.d/php.gpg 100%[=========================================================================>] 1.73K --.-KB/s in 0s

2019-03-18 22:22:18 (8.80 MB/s) - ‘/etc/apt/trusted.gpg.d/php.gpg’ saved [1769/1769]

Ora potete proceder con il

$ apt update

Di andrea

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