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I've been attempting to determine root cause of this problem for months.
Symptom is group/other permissions being dropped from all /dev/* files.
This only occurs on some machines, so some machine udev updates work,
some machines quietly fail.
Looks like the problem relates to...
1) APT /etc/apt/apt.conf.d/10periodic APT::Periodic::Update-Package-
Lists == 1, which triggers auto upgrades for critical packages.
2) This triggers the udev package run as an unattended/automatic
upgrade.
3) When udev package updates, /var/log/dpkg.log shows no errors.
4) /dev/* files have group/other permissions stripped.
5) LXD containers become unstable, as containers /dev points to machine
/dev.
Temp fix is change /etc/apt/apt.conf.d/10periodic - APT::Periodic
::Update-Package-Lists == 0 to disable all unattended upgrades.
Someone let me know where I can find APT/DPKG logs detailing exactly
what post install hook scripts run for udev, so I can look for errors.
Or if log verbosity has to be increased for this level of logging, let
me know how to increase verbosity, so next time udev updates, I can
provide logging detail sufficient to generate a fix for this problem.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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udev /dev/null incorrect permissions after package auto upgrades
https://bugs.launchpad.net/bugs/1846367
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