This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:

** Tags added: iso-testing

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  Reinstall Ubuntu (with preserving existing data) fails due to "Could
  not get lock /target/var/cache/apt/archives/lock"

Status in APT:
Status in ubiquity:
Status in apt package in Ubuntu:

Bug description:
  When trying to reinstall an existing Ubuntu cosmic installation using
  latest 18.10 desktop images, the install fails 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

  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 
   * Finish configuration

  The install will fail around the end of the installation process.

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