[Bug 1758004] Re: [Ubuntu 18.04] Error installing the "Basic Ubuntu Server"

[Steve Langasek]

The python3-cryptography package's dependencies are correct; both
python3-cffi-backend-api-min (= 9729) and python3-cffi-backend-api-max
(=10495) are provided by python3-cffi-backend 1.11.5-1, so the package
is installable in the archive.

However, python3-cffi-backend has not been pulled into the package pool
on the ISO, so an install without access to network apt sources is going
to fail.

This is a bug in the CD mastering scripts, which probably don't
understand versioned provides (a relatively recent feature of dpkg).

** Package changed: debian-installer (Ubuntu) => ubuntu-cdimage

** Changed in: ubuntu-cdimage
       Status: Confirmed => Triaged

** Changed in: ubuntu-cdimage
     Assignee: Skipper Bug Screeners (skipper-screen-team) => Steve Langasek (vorlon)

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Title:
  [Ubuntu 18.04] Error installing the "Basic Ubuntu Server"

Status in Ubuntu on IBM z Systems:
  Triaged
Status in germinate package in Ubuntu:
  Triaged

Bug description:
  When selecting the "Basic Ubuntu Server" from the installation dialogs
  of the daily-build ISO 390 images, the following error message is
  displayed:

       Installation step failed
       An installation step failed. You can try to run the failing item again from the menu,
       or skip it and choose something else. The failing step is: Select and install software

  At the time of the error, the /var/log/syslog file of the installer
  system showed the following entries:

  Mar 22 08:21:03 in-target: The following information may help to resolve the situation:
  Mar 22 08:21:03 in-target: 
  Mar 22 08:21:03 in-target: The following packages have unmet dependencies:
  Mar 22 08:21:03 in-target:  python3-cryptography : Depends: python3-cffi-backend-api-min (<= 9729) but it is not installable
  Mar 22 08:21:03 in-target:                         Depends: python3-cffi-backend-api-max (>= 9729) but it is not installable
  Mar 22 08:21:03 in-target: E
  Mar 22 08:21:03 in-target: : 
  Mar 22 08:21:03 in-target: Unable to correct problems, you have held broken packages.
  Mar 22 08:21:03 in-target: 
  Mar 22 08:21:03 in-target: tasksel: apt-get failed (100)
  Mar 22 08:21:04 main-menu[366]: WARNING **: Configuring 'pkgsel' failed with error code 1
  Mar 22 08:21:04 main-menu[366]: WARNING **: Menu item 'pkgsel' failed.

  The problem occured when installing from the daily builds from 19.
  through 22. March 2018.

  Installation logs/information from the /var/log/installer directory
  are attached.

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