Something like that Python script should be enough really to catch most
issues:

import apt_pkg, os

apt_pkg.init()

dir = apt_pkg.config.find_dir("Dir::Cache::Archives")
while True:
  try:
    apt_pkg.get_lock(os.path.join(dir, "lock"))
    break
  except:
    continue

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https://bugs.launchpad.net/bugs/1820886

Title:
  Potential inconsistency due to system halt/reboot being allowed when
  package installation in progress

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