/etc/apt.conf.d/10periodic:
APT::Periodic::Update-Package-Lists "1"; APT::Periodic::Download-Upgradeable-Packages "0"; APT::Periodic::AutocleanInterval "0";
$ cat /etc/crontab:
# /etc/crontab: system-wide crontab # Unlike any other crontab you don't have to run the `crontab' # command to install the new version when you edit this file # and files in /etc/cron.d. These files also have username fields, # that none of the other crontabs do. SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly 25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily ) 47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly ) 52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly ) #
$ systemctl list-timers --all
NEXT LEFT LAST PASSE Sat 2019-09-07 12:32:25 CEST 41min left Sat 2019-09-07 11:34:38 CEST 16min Sat 2019-09-07 18:51:11 CEST 7h left Sat 2019-09-07 09:00:40 CEST 2h 50 Sun 2019-09-08 00:00:00 CEST 12h left Sat 2019-09-07 00:01:09 CEST 11h a Sun 2019-09-08 00:00:00 CEST 12h left Sat 2019-09-07 00:01:09 CEST 11h a Sun 2019-09-08 04:43:19 CEST 16h left Sat 2019-09-07 09:00:40 CEST 2h 50 Sun 2019-09-08 06:10:51 CEST 18h left Sat 2019-09-07 06:25:33 CEST 5h 25 Sun 2019-09-08 09:16:50 CEST 21h left Sat 2019-09-07 09:16:50 CEST 2h 34 Mon 2019-09-09 00:00:00 CEST 1 day 12h left Mon 2019-09-02 00:00:24 CEST 5 day n/a n/a n/a n/a 9 timers listed.