Sorry for the delay, I just found this bug again in a lost Firefox tab.
I've uploaded a fix to the unapproved SRU queue for Xenial and it is
awaiting review by an SRU team member.

** Description changed:

  [Test Case]
  1) wget https://dl.winehq.org/wine-builds/Release.key
  2) sudo apt-key add Release.key
  3) sudo apt-add-repository 'https://dl.winehq.org/wine-builds/ubuntu/'
  4) sudo apt-get update
  5) sudo apt-get install wine-devel-i386=2.10.0~xenial
  6) /usr/lib/update-notifier/apt-check -p
  7) Observe the following crash:
  E: Unknown Error: '<class 'KeyError'>' ("The cache has no package named 
'wine-devel-i386'")
+ 
+ With the version of the package from proposed you'll be able to run apt-
+ check -p with no Error being reported.
  
  Original Description
  --------------------
  Release:
  
  $ lsb_release -rd
  Description:    Ubuntu 16.04 LTS
  Release:        16.04
  
  Pacakge:
  $ apt-cache policy update-notifier
  update-notifier:
    Installed: 3.168
    Candidate: 3.168
    Version table:
   *** 3.168 500
          500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status
  
  What should happen:
  
  $/usr/lib/update-notifier$ /usr/lib/update-notifier/apt-check -p
  wine-devel-amd64
  wine-devel
  google-chrome-stable
  winehq-devel
  wine-devel-i386
  
  What actually happened:
  
  $/usr/lib/update-notifier/apt-check -p
  E: Unknown Error: '<class 'KeyError'>' ("The cache has no package named 
'wine-devel-i386'")
  
  Whats wrong:
  
  apt_check.py line 143:
  
  ignored = ul._is_ignored_phased_update(aptcache[pkg.name])
  
  needs to use a full package name that includes the arch:
  
  ignored =
  ul._is_ignored_phased_update(aptcache[pkg.get_fullname(False)])
  
  There are many other reports of this problem - the suggested 'solution' in 
many cases is to run package manager/apt to install all the updates which then 
'fixes' the problem until the next
  update for wine becomes available.
  
  https://bugs.launchpad.net/pipelight/+bug/1318321
  http://askubuntu.com/questions/409243/update-notifier-doesnt-work-cache-issue
  
https://www.kubuntuforums.net/showthread.php?64504-Update-notifier-doesn-t-work-cache-issue
  
http://askubuntu.com/questions/581480/unknown-error-class-keyerror-the-cache-has-no-package-named-wine-stagin
  
http://askubuntu.com/questions/594888/how-can-i-resolve-repeated-package-dependency-error-involving-wine-staging-i38
  http://ubuntuforums.org/showthread.php?t=2222677

** Changed in: update-notifier (Ubuntu Xenial)
     Assignee: (unassigned) => Brian Murray (brian-murray)

** Changed in: update-notifier (Ubuntu Xenial)
       Status: Triaged => In Progress

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https://bugs.launchpad.net/bugs/1597537

Title:
  "the cache has no package" error when wine update is available

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