Comment 1 for bug 1639977

Here's the Traceback:

Traceback (most recent call last):
  File "/usr/bin/unattended-upgrade", line 1468, in <module>
    main(options)
  File "/usr/bin/unattended-upgrade", line 1331, in main
    write_stamp_file()
  File "/usr/bin/unattended-upgrade", line 1011, in write_stamp_file
    with open(os.path.join(statedir, "unattended-upgrades-stamp"), "w"):
FileNotFoundError: [Errno 2] No such file or directory: '/var/lib/apt/periodic/unattended-upgrades-stamp'