Public bug reported:
I have noticed a strange behaviour in unattended upgrades. The host in
question is scheduled to run upgrades on Mondays every second week.
However, this week it ran upgrades on Tuesday instead (2019-04-09).
This is the first time I’ve noticed this behaviour. I checked the logs
in /var/log/apt/history.log* and I saw that worked as intended up until
this week. Upgrades ran as expected on 2019-03-11 and 2019-03-25, which
where both Mondays.
The schedule was set with the line 'APT::Periodic::Unattended-Upgrade
"14";' in the file /etc/apt/apt.conf.d/20auto-upgrades.
Could it be daylight savings time that has caused skewing of the
schedule?
The server is located in Sweden and on 2019-03-31 we switched from CET
to CEST. If the time diff is calculated with hours instead of calendar
days passed, perhaps the missing hour on 2019-03-31 caused the scheduler
to believe that on Monday 2019-03-08, two weeks (336 hours) had not yet
passed.
ADDITIONAL INFO
Description: Ubuntu 16.04.6 LTS
Release: 16.04
apt:
Installed: 1.2.29ubuntu0.1
Candidate: 1.2.31
Version table:
1.2.31 500
500 http://se.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
*** 1.2.29ubuntu0.1 500
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64
Packages
100 /var/lib/dpkg/status
1.2.10ubuntu1 500
500 http://se.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
unattended-upgrades:
Installed: 0.90ubuntu0.10
Candidate: 0.90ubuntu0.10
Version table:
*** 0.90ubuntu0.10 500
500 http://se.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
500 http://se.archive.ubuntu.com/ubuntu xenial-updates/main i386
Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64
Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages
100 /var/lib/dpkg/status
0.90 500
500 http://se.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
500 http://se.archive.ubuntu.com/ubuntu xenial/main i386 Packages
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: apt 1.2.29ubuntu0.1
ProcVersionSignature: Ubuntu 4.4.0-142.168-generic 4.4.167
Uname: Linux 4.4.0-142-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Wed Apr 10 09:06:49 2019
InstallationDate: Installed on 2017-12-28 (467 days ago)
InstallationMedia: Ubuntu-Server 16.04.3 LTS "Xenial Xerus" - Release amd64
(20170801)
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: apt (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
** Attachment added: "Log data from apt"
https://bugs.launchpad.net/bugs/1824088/+attachment/5254614/+files/history.txt
** Attachment removed: "Log data from apt"
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1824088/+attachment/5254614/+files/history.txt
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https://bugs.launchpad.net/bugs/1824088
Title:
unattended upgrade ran one day after schedule
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