[Bug 1512326] Re: Running apt-check --package-names returns an unknown error

[Stephen]

I can confirm this bug.   I'm also seeing this on my system that I just
upgraded to Wily.  This problem did not exist prior to the upgrade.

$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=15.10
DISTRIB_CODENAME=wily
DISTRIB_DESCRIPTION="Ubuntu 15.10"

I have a cron job that uses apt-check to check for available updates.
This bug is breaking it.

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https://bugs.launchpad.net/bugs/1512326

Title:
  Running apt-check --package-names returns an unknown error

Status in update-notifier package in Ubuntu:
  Confirmed

Bug description:
  When running /usr/lib/update-notifier/apt-check --package-names the
  following error is returned:

  $ /usr/lib/update-notifier/apt-check --package-names
  E: Unknown Error: '<class 'TypeError'>' (map() must have at least two arguments.)

  What I expected was a list of packages which can be upgraded.

  From what I understand, the map function requires 2 arguments, but the
  list comprehension used is only creating a single argument, which is
  the package name.

  I found if  I changed the function

  def write_package_names(outstream, cache, depcache):
      " write out package names that change to outstream "
      pkgs = [pkg for pkg in cache.packages if depcache.marked_install(pkg) or
          depcache.marked_upgrade(pkg)]
      outstream.write("\n".join(map([p.name for p in pkgs])))


  def write_package_names(outstream, cache, depcache):
      " write out package names that change to outstream "
      pkgs = [pkg for pkg in cache.packages if depcache.marked_install(pkg) or
          depcache.marked_upgrade(pkg)]
      outstream.write("\n".join([p.name for p in pkgs]))        #Removed the map() function

  
  Additional info:
  $ lsb_release -rd
  Description:    Ubuntu 15.10
  Release:        15.10

  $ apt-cache policy update-notifier-common
  update-notifier-common:
    Installed: 3.163
    Candidate: 3.163
    Version table:
   *** 3.163 0
          500 http://gb.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
          100 /var/lib/dpkg/status

  Thanks

  Dave

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