EXPKEYSIG debian ubuntu

Fix EXPKEYSIG B188E2B695BD4743

DEB.SURY.ORG Automatic Signing Key <deb@sury.org> — by Ondřej Surý

Official Key Page: https://deb.sury.org/
Error message 
EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key <deb@sury.org>

Your distro

Fix commands for RHEL / CentOS / AlmaLinux

Method 1 Import from official URL

Directly imports the GPG key from the vendor URL into the RPM database.

RHEL / CentOS / AlmaLinux — bash
$ sudo rpm --import https://packages.sury.org/php/apt.gpg
$ sudo yum check-update || sudo dnf check-update
Official documentation

Method 2 Import via GnuPG then rpm

Compatible with RHEL, CentOS, AlmaLinux and Rocky Linux (both yum and dnf).

RHEL / CentOS / AlmaLinux — bash
$ gpg --keyserver hkps://keys.openpgp.org --recv-keys B188E2B695BD4743
$ gpg --export --armor B188E2B695BD4743 | sudo rpm --import -
$ sudo yum check-update || sudo dnf check-update

After importing the key

Run sudo apt-get update (or your distro's equivalent) again. If successful you should see Hit: lines with no EXPKEYSIG warnings. Still broken? Check that your /etc/apt/sources.list.d/ entry references the correct [signed-by=…] keyring path.