unattended-upgrades を入れた

$ sudo apt install unattended-upgrades
$ sudo dpkg-reconfigure unattended-upgrades
Replacing config file /etc/apt/apt.conf.d/20auto-upgrades with new version
$ cat  /etc/apt/apt.conf.d/20auto-upgrades
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";
$ sudo vi /etc/apt/apt.conf.d/50unattended-upgrades
$ sudo git -C /etc diff /etc/apt/apt.conf.d/50unattended-upgrades
diff --git a/apt/apt.conf.d/50unattended-upgrades b/apt/apt.conf.d/50unattended-upgrades
index 26f84e133..007af9182 100644
--- a/apt/apt.conf.d/50unattended-upgrades
+++ b/apt/apt.conf.d/50unattended-upgrades
@@ -92,13 +92,13 @@ Unattended-Upgrade::Package-Blacklist {
 // If empty or unset then no email is sent, make sure that you
 // have a working mail setup on your system. A package that provides
 // 'mailx' must be installed. E.g. "user@example.com"
-//Unattended-Upgrade::Mail "";
+Unattended-Upgrade::Mail "user@example.com";
 // Set this value to one of:
 //    "always", "only-on-error" or "on-change"
 // If this is not set, then any legacy MailOnlyOnError (boolean) value
 // is used to chose between "only-on-error" and "on-change"
-//Unattended-Upgrade::MailReport "on-change";
+Unattended-Upgrade::MailReport "always";
 // Remove unused automatically installed kernel-related packages
 // (kernel images, kernel headers and kernel version locked tools).
$ sudo unattended-upgrade --dry-run --debug
$ sudo unattended-upgrade --debug

apticronは消していいかな?

$ sudo apt remove apticron