I see, this must have been updated on a later version.
Under Ubuntu 16.04.5, and up to apt-1.2.27, the man page reads:
PERIODIC AND ARCHIVES OPTIONS
APT::Periodic and APT::Archives groups of options configure behavior of
apt periodic
updates, which is done by the /etc/cron.daily/apt script. See the top of
this script
for the brief documentation of these options.
This must have been fixed upstream in a later version.
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https://bugs.launchpad.net/bugs/1764928
Title:
Please document apt-daily
Status in apt package in Ubuntu:
Invalid
Bug description:
The following systemd services are installed along with apt:
/lib/systemd/system/apt-daily.timer
/lib/systemd/system/apt-daily-upgrade.timer
/lib/systemd/system/apt-daily-upgrade.service
/lib/systemd/system/apt-daily.service
By default, these run the equivalent of "apt update", and "apt
upgrade" at specified times. However, this behavior is documented
nowhere in the man pages or /usr/share/doc.
Furthermore, they run the command /usr/lib/apt/apt.systemd.daily,
which is also undocumented, nor does it respond to a --help option. A
non-savvy Linux user will not be able to determine that this is a
shell script and find out what it does. Or worse, a partially-savvy
Linux user will be able to determine that this is a shell script, and
will read it imperfectly (usage is also not described in script
comments) ending up with a wrong idea of what it does.
The idea is to keep the system updates. That is a GOOD THING (tm).
But it relies on undocumented behavior. That is a BAD THING (tm).
Can we have the apt-daily service documented?
madumlao@lezard ~ $ lsb_release -rd
Description: Ubuntu 16.04.4 LTS
Release: 16.04
apt version: 1.2.26
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