[Bug 1798369] Re: Reinstall Ubuntu (with preserving existing data) shows error message due to "Could not get lock /target/var/cache/apt/archives/lock"

[Mathieu Trudel-Lapierre]

** Tags removed: rls-ee-incoming

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https://bugs.launchpad.net/bugs/1798369

Title:
  Reinstall Ubuntu (with preserving existing data) shows error message
  due to "Could not get lock /target/var/cache/apt/archives/lock"

Status in APT:
  New
Status in ubiquity:
  New
Status in apt package in Ubuntu:
  Invalid
Status in ubiquity package in Ubuntu:
  Confirmed
Status in apt source package in Eoan:
  Invalid
Status in ubiquity source package in Eoan:
  Confirmed

Bug description:
  When trying to reinstall an existing Ubuntu cosmic installation using
  latest 18.10 desktop images, the install shows an error dialog around
  the end of the installation with an "Error restoring installed
  applications". Looking at the syslog such a traceback can be seen:

  apt_pkg.Error: E:Could not get lock
  /target/var/cache/apt/archives/lock - open (11: Resource temporarily
  unavailable), E:Unable to lock directory
  /target/var/cache/apt/archives/

  After reproducing this on a live session, after chrooting into /target
  indeed any apt-get install operations result in the same lock-file
  error. The whole syslog of the reinstall attached to the bug.

  Test case:
   * Download latest cosmic image
   * Install cosmic on the whole disk (can be on a VM)
   * (optional) Boot into the system and leave a file in the home directory (to leave a trace, just in case)
   * Reboot and install cosmic using the first option in ubiquity: Reinstall Ubuntu
   * Finish configuration

  The install itself doesn't fail, but around the end of the
  installation process the error dialog appears. System is still
  bootable but left with old packages.

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