Mege with extenal repo

scripts/tc/config/20auto-upgrades

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+APT::Periodic::Update-Package-Lists "1";
+APT::Periodic::Download-Upgradeable-Packages "1";
+APT::Periodic::AutocleanInterval "7";
+APT::Periodic::Unattended-Upgrade "1";

scripts/tc/config/50unattended-upgrades

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+APT::Periodic::Update-Package-Lists "1";
+APT::Periodic::Download-Upgradeable-Packages "1";
+APT::Periodic::AutocleanInterval "7";
+APT::Periodic::Unattended-Upgrade "1";
+Unattended-Upgrade::Mail "root";
+
+// Automatically upgrade packages from these 
+Unattended-Upgrade::Origins-Pattern {
+      "o=Debian,a=stable";
+      "o=Debian,a=stable-updates";
+      "o=Debian,a=proposed-updates";
+      "origin=Debian,codename=${distro_codename},label=Debian-Security";
+};
+
+// You can specify your own packages to NOT automatically upgrade here
+Unattended-Upgrade::Package-Blacklist {
+//      "vim";
+//      "libc6";
+//      "libc6-dev";
+//      "libc6-i686";
+
+};
+
+Unattended-Upgrade::MailOnlyOnError "false";
+Unattended-Upgrade::Automatic-Reboot "false";