Update from 4.0.8.3 to 4.1.7.4 stops with error message

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This is because the DPA has a new signing key.
To resolve this problem you have to update the APT signing key, downloading the new key from the repositories:

$ sudo wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg

Or try this

$ sudo apt-key del 95BD4743; wget -nv -O - https://packages.sury.org/php/apt.gpg | sudo apt-key add -

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System package update error