[Bug 1897778] Re: DistUpgradeController to release apt lock during PostInstallScripts

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~chad.smith/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/391183

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https://bugs.launchpad.net/bugs/1897778

Title:
  DistUpgradeController to release apt lock during PostInstallScripts

Status in ubuntu-release-upgrader package in Ubuntu:
  In Progress

Bug description:
  In order for custom PostInstallScript to add/remove apt packages and
  call apt update, DistUpgradecontroller needs to release the apt cache
  directory lock before that stage.

  If the lock is still in place,
  DistUpgradeController.runPostUpgradeScripts hits errors such as:

  
  E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
  E: Unable to lock directory /var/lib/apt/lists/

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