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$ pwd: /var/lib/dpkg/info/
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File: /var/lib/dpkg/info/ubuntu-keyring.postinst
#!/bin/sh

set -e

if [ "$1" = 'configure' -a -n "$2" ]; then
	# remove keys from the trusted.gpg file as they are now shipped in fragment files in trusted.gpg.d
	if dpkg --compare-versions "$2" 'lt' "2016.09.19" && which gpg > /dev/null && which apt-key > /dev/null; then
		TRUSTEDFILE='/etc/apt/trusted.gpg'
		eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
		eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f)
		if [ -e "$TRUSTEDFILE" ]; then
			for KEY in 40976EAF437D05B5 46181433FBB75451 3B4FE6ACC0B21F32 D94AA3F0EFE21092; do
				apt-key --keyring "$TRUSTEDFILE" del $KEY > /dev/null 2>&1 || :
			done
		fi
	fi
fi
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