[Bug 1704854] [NEW] Ubuntu 16.04.3 Installation fails when selecting all software to install

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---Problem Description---
Ubuntu 16.04.3 Installtion fails when all the software is selected while installing.


---Environment---
Power8(Briggs)/Power9(Boston) 

---Steps to reproduce---
1.Begin 16.04.3 Installation(Netboot)
2.Select and install software  : Select all.

Fails in the below step.

---Failing stage---

Select and install software

     ????????????????? [!!] Select and install software ??????????????????
     ?                                                                   ?
     ?                     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                      ?
     ?                                                                   ?
     ?                            <Continue>                             ?
     ?                                                                   ?
     ?????????????????????????????????????????????????????????????????????




<Tab> moves; <Space> selects; <Enter> activates buttons


I was able to reproduce this bug and actually there are 3 problems happening.

1) The package libgles1-mesa depends on version 12.0.6-0 of libglapi-
mesa package, but there is a new version available (17.0.7-0) and it is
failing the installation


2) When selecting all software to install, it tries to install both libavcodec-ffmpeg-extra56 and libavcodec-ffmpeg56 packages, however libavcodec-ffmpeg-extra56 package conflicts with libavcodec-ffmpeg56:

$ apt-cache depends  libavcodec-ffmpeg-extra56
	Conflicts: libavcodec-ffmpeg56


3) When selecting all software to install, it tries to install mythbuntu-default-settings, ubuntustudio-default-settings and xubuntu-default-settings, however mythbuntu-default-settings conflicts with both packages:

$ apt-cache depends mythbuntu-default-settings
	Conflicts: ubuntustudio-default-settings
  	Conflicts: xubuntu-default-settings

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-156652 severity-high targetmilestone-inin---
-- 
Ubuntu 16.04.3 Installation fails when selecting all software to install
https://bugs.launchpad.net/bugs/1704854
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