[Bug 1838897] [NEW] LTS dist upgrade from 14.04 to 16.04 ok, then directly to 18.04 failure with dependency problems

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Hello,

lsb_release -rd
Description:	Ubuntu 18.04.2 LTS
Release:	18.04

I am not sure what the package name is for the update manager, so I
check the "I don't know" option, sorry for that. I try this one, just in
case:

apt-cache policy update-manager
update-manager:
  Installé : 1:18.04.11.10
  Candidat : 1:18.04.11.10
 Table de version :
 *** 1:18.04.11.10 500
        500 http://ch.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://ch.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
        100 /var/lib/dpkg/status
     1:18.04.11 500
        500 http://ch.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        500 http://ch.archive.ubuntu.com/ubuntu bionic/main i386 Packages

I upgraded with the update manager (with the GUI) from Ubuntu 14.04 LTS
to Ubuntu 16.04 LTS,

This was perfectly done, I rebooted with the new 16.04 version, and
tried several programs: mail, network, firefox, gedit, libreoffice...
everything was fine, so 10 minutes after, I launched the update manager
with the GUI again to Upgrade to Ubuntu 18.04 LTS. I did this Without
having done any other update using the 16.04 LTS.

The packages were downloaded ok, but the installation failed with
multiple messages like this one (may not be accurate, I translate "on
the fly" from french). Sorry, I did not find any log to copy those
messages, and the files cannot be browsed from the gui anymore. I had to
search the files and edit them with "vi" (gedit was no more usable), and
found nothing useful. So here is(are) the message(s):

   "Impossible to install «systemd»
   The upgrade will continue, but the package «systemd» may not run.
   Please do report this as a bug."

Then:
   "installed systemd package post-installation script subprocess returned error exit status 1".

Then I had more than 20 packages ending to similar error messages:
"dependency problems - leaving unconfigured"

Among those broken packages:
   systemd-sysv, init,dbus-user-session, policykit-1, aptdaemon, synaptic, gnome-settings-daemon,
   mutter, gnome-shell, policykit-1-gnome, update-manager, update-notifier, ubuntu-system-service,
   network-manager, netwirk-manager-pptp, network-manager-gnome... etc.
With libpam-systemd package there was an error number displayed with the message:
   66.8035: dependency problems - leaving unconfigured.

I am filing this bug before I reboot, I don't even know if I will be
able to restart a previous Ubuntu version.

Please tell me if I can help adding commands outputs or attaching log files, and where I am supposed to find those logs... I saw other similar bugs or this question: https://answers.launchpad.net/ubuntu/+question/670525
... but nothing was close enough to my problem, so here I am.

Thank you for your understanding and hints...
Enrico.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
LTS dist upgrade from 14.04 to 16.04 ok, then directly to 18.04 failure with dependency problems
https://bugs.launchpad.net/bugs/1838897
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