[Bug 1891599] Re: installation stopped by an random exception from mark_install() in Cache class of python3-apt

[Shih-Yuan Lee]

The fix for LP: #1908023 will cover/replace the fix of this bug.

** Changed in: oem-priority
       Status: In Progress => Fix Released

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Title:
  installation stopped by an random exception from mark_install() in
  Cache class of python3-apt

Status in OEM Priority Project:
  Fix Released
Status in ubiquity package in Ubuntu:
  Fix Committed

Bug description:
  Exception in the installation

  Aug 12 19:26:59 ubuntu /plugininstall.py: Exception during installation:
  Aug 12 19:26:59 ubuntu /plugininstall.py: Traceback (most recent call last):
  Aug 12 19:26:59 ubuntu /plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 235, in run
  Aug 12 19:26:59 ubuntu /plugininstall.py:     self.install_extras()
  Aug 12 19:26:59 ubuntu /plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line 1212, in install_extras
  Aug 12 19:26:59 ubuntu /plugininstall.py:     self.do_install(filtered_extra_packages)
  Aug 12 19:26:59 ubuntu /plugininstall.py:   File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 941, in do_install
  Aug 12 19:26:59 ubuntu /plugininstall.py:     mark_install(cache, pkg)
  Aug 12 19:26:59 ubuntu /plugininstall.py:   File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 553, in mark_install
  Aug 12 19:26:59 ubuntu /plugininstall.py:     raise InstallStepError(
  Aug 12 19:26:59 ubuntu /plugininstall.py: ubiquity.install_misc.InstallStepError: Unable to install 'libgbm1' due to conflicts.

  This happen in oem project because we have lots pkg to upgrade during
  installation because the design of factory process need it.

  As package list have certain dependency, and the the order that we get
  the pkg from the python set object is not good for underlying apt
  engine, then exception will raise.

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