kazulog@sv1:~$ sudo cp /tmp/50u.bak /etc/apt/apt.conf.d/50unattended-upgrades
kazulog@sv1:~$ sudo rm /etc/apt/apt.conf.d/51custom-reboot
kazulog@sv1:~$ grep -nE 'distro_codename' /etc/apt/apt.conf.d/50unattended-upgrades | head -8
7:	"${distro_id}:${distro_codename}";
8:	"${distro_id}:${distro_codename}-security";
13:	"${distro_id}ESMApps:${distro_codename}-apps-security";
14:	"${distro_id}ESM:${distro_codename}-infra-security";
15://	"${distro_id}:${distro_codename}-updates";
16://	"${distro_id}:${distro_codename}-proposed";
17://	"${distro_id}:${distro_codename}-backports";
kazulog@sv1:~$ apt-config dump APT::Periodic
APT::Periodic "";
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::AutocleanInterval "0";
APT::Periodic::Unattended-Upgrade "1";
kazulog@sv1:~$ apt-config dump Unattended-Upgrade::Automatic-Reboot
kazulog@sv1:~$ systemctl is-enabled apt-daily.timer apt-daily-upgrade.timer
enabled
enabled