Some thoughts here:
- bash is shown as being unpacked immediately before this. bash is an
essential package.
- the package which triggers the plymouth theme packages is base-files, which
ships /etc/lsb-release. base-files is also an essential package.
- apt tries to handle Essential packages specially, by configuring them as
quickly as possible.
- the plymouth packages use 'interest' triggers, not 'interest-noawait'
triggers, so the base-files package can't be configured until after the
plymouth triggers have been run.
- dpkg doesn't let the triggers be run before the dependencies are configured.
I think it's very likely that this is a package manager bug, since I
don't see any dependency loops anywhere involving lsb-release and
plymouth-themes-ubuntu-text. However, we can probably also work around
it by making the plymouth triggers use interest-noawait instead, so that
they do not block the configuration of essential packages.
I also think this warrants an SRU, since the version of the theme
package being triggered may be the old version during a release upgrade.
** Also affects: plymouth (Ubuntu)
Importance: Undecided
Status: New
** Also affects: kubuntu-settings (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1750465
Title:
upgrade attempting to process triggers out of order (package plymouth-
theme-ubuntu-text 0.9.2-3ubuntu17 failed to install/upgrade:
dependency problems - leaving triggers unprocessed)
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