Comment 1 for bug 1661460

Example excerpt of a debian installer log:

Feb 3 00:31:15 pkgsel: starting tasksel
Feb 3 00:31:19 in-target: debconf: unable to initialize frontend: Passthrough
Feb 3 00:31:19 in-target: debconf: (Failed to open fd 3: Bad file descriptor at (eval 19) line 3.)
Feb 3 00:31:19 in-target: debconf: falling back to frontend: Noninteractive
Feb 3 00:31:19 in-target: ^MExtracting templates from packages: 35%
Feb 3 00:31:19 in-target: ^MExtracting templates from packages: 70%
Feb 3 00:31:19 in-target: ^MExtracting templates from packages: 100%
Feb 3 00:32:23 in-target: Reading package lists...
Feb 3 00:32:23 in-target:
Feb 3 00:32:23 in-target: Building dependency tree...
Feb 3 00:32:23 in-target:
Feb 3 00:32:23 in-target: Reading state information...
Feb 3 00:32:23 in-target:
Feb 3 00:32:24 in-target: crda is already the newest version (3.13-1).

...

Feb 3 00:32:25 in-target: xz-utils is already the newest version (5.1.1alpha+20120614-2ubuntu2).
Feb 3 00:32:25 in-target: xz-utils set to manually installed.
Feb 3 00:32:25 in-target: Some packages could not be installed. This may mean that you have
Feb 3 00:32:25 in-target: requested an impossible situation or if you are using the unstable
Feb 3 00:32:25 in-target: distribution that some required packages have not yet been created
Feb 3 00:32:25 in-target: or been moved out of Incoming.
Feb 3 00:32:25 in-target: The following information may help to resolve the situation:
Feb 3 00:32:25 in-target:
Feb 3 00:32:25 in-target: The following packages have unmet dependencies:
Feb 3 00:32:25 in-target: appstream : Breaks: gnome-software (< 3.22.5-1) but 3.20.1+git20161013.0.d77d6cf-0ubuntu2~xenial1 is to be installed
Feb 3 00:32:25 in-target: E
Feb 3 00:32:25 in-target: :
Feb 3 00:32:25 in-target: Unable to correct problems, you have held broken packages.
Feb 3 00:32:25 in-target:
Feb 3 00:32:25 in-target: tasksel: apt-get failed (100)
Feb 3 00:32:25 main-menu[3385]: WARNING **: Configuring 'pkgsel' failed with error code 1
Feb 3 00:32:25 main-menu[3385]: WARNING **: Menu item 'pkgsel' failed.