As a workaround, I put this entry in my file 
/etc/systemd/system/apt-daily.timer :
---
OnCalendar=*-*-* 0,2,4,6,8,10,12,14,16,18,20,22:00
---

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https://bugs.launchpad.net/bugs/1662677

Title:
  apt-daily.service could rarely update the system

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