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

[Launchpad Bug Tracker]

This bug was fixed in the package ubuntu-release-upgrader - 1:20.10.12

---------------
ubuntu-release-upgrader (1:20.10.12) groovy; urgency=medium

  [ Chad Smith ]
  * data/mirrors.cfg: add ubuntu advantage pro PPA url as valid mirror
    (LP: #1893717)
  * DistUpgrade/DistUpgradeController.py: release cache lock during
    runPostInstallScripts (LP: #1897778)

  [ Brian Murray ]
  * DistUpgrade/DistUpgradeQuirks.py: In addition to quirking python-minimal
    we also need to quirk python-dbg. (LP: #1887544)
  * Update demotions and mirrors data.

 -- Chad Smith <chad.smith at canonical.com>  Tue, 22 Sep 2020 16:59:52
-0600

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: In Progress => Fix Released

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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:
  Fix Released

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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