Starting with:
ii  apt                                             1.2.20                      
 amd64                        commandline package manager

The following timers are present:
# systemctl list-timers
NEXT                         LEFT          LAST PASSED UNIT                     
    ACTIVATES
Fri 2017-07-28 09:42:31 UTC  14min left    n/a  n/a    
systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service
Fri 2017-07-28 12:52:15 UTC  3h 24min left n/a  n/a    snapd.refresh.timer      
    snapd.refresh.service
Sat 2017-07-29 03:09:15 UTC  17h left      n/a  n/a    apt-daily.timer          
    apt-daily.service

The apt-daily.service is going to run, unexpectadly, at 3:09am.

Upgrading just apt:
ii  apt                                             1.2.24                      
 amd64                        commandline package manager

# systemctl list-timers
NEXT                         LEFT       LAST                         PASSED     
  UNIT                         ACTIVATES
Fri 2017-07-28 09:42:31 UTC  12min left n/a                          n/a        
  systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service
Fri 2017-07-28 10:03:19 UTC  33min left n/a                          n/a        
  snapd.refresh.timer          snapd.refresh.service
Fri 2017-07-28 20:18:24 UTC  10h left   Fri 2017-07-28 09:27:35 UTC  1min 57s 
ago apt-daily.timer              apt-daily.service
Sat 2017-07-29 06:30:36 UTC  21h left   n/a                          n/a        
  apt-daily-upgrade.timer      apt-daily-upgrade.service

Now there is timer to do a refresh at a random time, yet there is a
predictable apt-daily-upgrade to apply the timer between 6 and 7am.

All of this looks good.

I will leave this container around, and will check if upgrades were
applied tomorrow.

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https://bugs.launchpad.net/bugs/1686470

Title:
  Apt updates that are uniformly spread across all timezones, with
  predictable application windows

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