** Description changed:

  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.
- 
- A workaround fix is move those failed debs to next iteration and the fix
- test pass as we try it in installation for like 50 times.
- 
- MP: https://code.launchpad.net/~ycheng-
- twn/ubuntu/+source/ubiquity/+git/ubiquity/+merge/390009

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https://bugs.launchpad.net/bugs/1891599

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

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