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

[Alex Tu]

for 1. improve the fault tolerance of Ubiquity while it calling external
library.

We are trying to have severial times retry in ubiquity before thow out the exception.
And the installation testing is in progress.

** Tags added: oem-priority originate-from-1891118 somerville

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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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