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

[Alex Tu]

** Tags added: originate-from-1891603

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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:
  New
Status in ubiquity package in Ubuntu:
  New

Bug description:
  An exception is randomly happening while ubiquity calling cachedpkg.mark_install() [1].
  cachedpkg.mark_install() came from Cache class of python3-apt package.

  It looks a timing issue while ubiquity calling
  cachedpkg.mark_install(), and a retry can workaround it.

  The reproduce rate is be about 1/15.

  Looks there're 2 things can be improved.
  1. improve the fault tolerance of Ubiquity while it calling external library.
  2. impvove the fault tolerance of python3-apt.

  [1]
  https://git.launchpad.net/ubuntu/+source/ubiquity/tree/ubiquity/install_misc.py?h=ubuntu
  /focal-updates#n534

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