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OS: Kubuntu 18.04.3

$ update-apt-xapian-index --version
update-apt-xapian-index 0.47
$

/etc/cron.weekly has apt-xapian-index. None of the other cron-related folders in /etc have apt-xapian-index or something similar.

Based on the location of apt-xapian-index, I'd expect it to run once a week.

However, running axi-cache info (after incorporating the workaround described by N0rbert here) leads me to believe it's running more frequently than that. Here's the relevant output over the last few days:

Update timestamp: /var/lib/apt-xapian-index/update-timestamp (last updated: Fri Sep 27 14:21:48 2019)
Update timestamp: /var/lib/apt-xapian-index/update-timestamp (last updated: Sun Sep 29 06:34:46 2019)
Update timestamp: /var/lib/apt-xapian-index/update-timestamp (last updated: Mon Sep 30 06:31:35 2019)

Why is that? How does update-apt-xapian-index know when and how often to run instead of running just once a week?

Edit: I should add that I exclusively use sudo apt update and sudo apt full-upgrade. I don't use package managers such as muon or synaptic or any software center which may cause update-apt-xapian-index to run in order to updates their datbases or internal indexes.

$ systemctl list-timers --all
NEXT                         LEFT        LAST                         PASSED       UNIT                         ACTIVATES
Mon 2019-09-30 18:02:59 IST  8min left   Mon 2019-09-30 17:03:42 IST  50min ago    anacron.timer                anacron.service
Tue 2019-10-01 03:29:28 IST  9h left     Mon 2019-09-30 06:27:35 IST  11h ago      apt-daily.timer              apt-daily.service
Tue 2019-10-01 05:36:56 IST  11h left    Mon 2019-09-30 12:36:49 IST  5h 17min ago motd-news.timer              motd-news.service
Tue 2019-10-01 06:17:32 IST  12h left    Mon 2019-09-30 06:27:35 IST  11h ago      apt-daily-upgrade.timer      apt-daily-upgrade.service
Tue 2019-10-01 06:42:49 IST  12h left    Mon 2019-09-30 06:42:49 IST  11h ago      systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service
Mon 2019-10-07 00:00:00 IST  6 days left Mon 2019-09-30 06:27:35 IST  11h ago      fstrim.timer                 fstrim.service
n/a                          n/a         Mon 2019-09-30 06:28:35 IST  11h ago      ureadahead-stop.timer        ureadahead-stop.service

7 timers listed.
$
DK Bose
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    Systemd timers? systemctl list-timers --all – user535733 Sep 30 '19 at 12:19
  • @user535733, I've added the output for my system. So is apt-daily.timer or apt-daily-upgrade.timer related to update-apt-xapian-index? But then what is the meaning of having update-apt-xapian-index in /etc/cron.weekly? – DK Bose Sep 30 '19 at 12:29

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