Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 72, in __enter__
    return self._lock.__enter__()
apt_pkg.Error: E:Could not get lock /var/cache/apt/archives/lock. It is held by process 26973 (apt-get)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/unattended-upgrade", line 2522, in <module>
    sys.exit(main(options))
  File "/usr/bin/unattended-upgrade", line 1993, in main
    res = run(options, rootdir, mem_log, logfile_dpkg,
  File "/usr/bin/unattended-upgrade", line 2412, in run
    pkgs_kept_installed) = do_auto_remove(
  File "/usr/bin/unattended-upgrade", line 1883, in do_auto_remove
    res, error = cache_commit(cache, logfile_dpkg, verbose)
  File "/usr/bin/unattended-upgrade", line 871, in cache_commit
    res = cache.commit(install_progress=iprogress)
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 657, in commit
    with self._archive_lock:
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 74, in __enter__
    raise LockFailedException(("Failed to lock directory %s: %s") %
apt.cache.LockFailedException: Failed to lock directory /var/cache/apt/archives/: E:Could not get lock /var/cache/apt/archives/lock. It is held by process 26973 (apt-get)