diff --git a/files/chroot_build.sh b/files/chroot_build.sh
index 83490f0..691443a 100755
--- a/files/chroot_build.sh
+++ b/files/chroot_build.sh
@@ -23,6 +23,7 @@ deb-src http://archive.ubuntu.com/ubuntu/ focal-security main restricted univers
 deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
 deb-src http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
 EOF
+apt-get install linuxmint-keyring
 apt-get update
 
 echo >&2 "===]> Info: Install systemd and Ubuntu MBP Repo... "