Install emdebian-archive-keyring by entering the following commands in the terminal:
sudo apt update sudo apt install emdebian-archive-keyring
Description:
GnuPG archive keys for the emdebian repository
Emdebian digitally signs its Release files. This package contains the archive key used for Emdebian repositories since 2015. . The key is also available via the Emdebian website and as a udeb for debian-installer support.
Homepage: http://www.emdebian.org/crush/keys.html
Version: 2.2
Section: universe/utils