[Bug 1799773] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for livecd-rootfs has
completed successfully and the package has now been released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1799773

Title:
  Accelerate the build: Drop unused checksum generation

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Xenial:
  Fix Committed
Status in livecd-rootfs source package in Bionic:
  Fix Released
Status in livecd-rootfs source package in Cosmic:
  Fix Released

Bug description:
  [Impact]

   * Image builds take time
   * Some of the time is spent computing checksums
   * Those checksums are never used
   * Time and energy is wasted
   * build/(md5|sha256)sum.txt is not used by livecd-rootfs and not exposed by launchpad-buildd

  [Test Case]

   * Build images
   * Disable checksums
   * Build images
   * Ensure image deliverables are unchanged

  [Regression Potential]

   * Someone was using the checksums outside of launchpad-buildd; because launchpad-buildd doesn't present those artifacts
   * The checksums are included beside the squashfs in live-build ISOs but none of our projects use live-build to build ISOs.

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