/usr/lib/update-notifier/package-data-downloader:FileNotFoundError:/usr/lib/update-notifier/package-data-downloader@327:process_download_requests

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding update-notifier. This problem was most recently seen with package version 3.168.2, the problem page at https://errors.ubuntu.com/problem/5fadffa13ce2da11635dac0da98df06aed937078 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker you can request it at http://forms.canonical.com/reports/.

[Brian Murray (brian-murray)]

Here's the Traceback:

Traceback (most recent call last):
  File "/usr/lib/update-notifier/package-data-downloader", line 327, in <module>
    process_download_requests()
  File "/usr/lib/update-notifier/package-data-downloader", line 229, in process_download_requests
    for para in hook.iter_paragraphs(open(file)):
FileNotFoundError: [Errno 2] No such file or directory: '/usr/share/package-data-downloads/ttf-mscorefonts-installer'

It's quite odd given that we find file using os.listdir() shortly before trying to open it.