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[Ubuntu Foundations Team Bug Bot <1537753@xxxxxxxxxxxxxxxxxx>]

The attachment "ucf_make-purge-grub-pc-work.diff" seems to be a patch.
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** Tags added: patch

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https://bugs.launchpad.net/bugs/1537753

Title:
  ucf --purge reaches code where basename doesn't have a parameter

Status in ucf package in Ubuntu:
  Confirmed

Bug description:
  When I was clearing up unpurged packages, grub-pc was not being purged because of an error "basename: missing operand".  Looked at the code and "ucf --purge /etc/default/grub" was bailing out at line 472, which has the code:
      old_mdsum_file="$source_dir/$(basename ${new_file}).md5sum";
  Looking at ${new_file} at the code above, sure enough, it wasn't being initialized at purge (line numbers 349 - 374).  So I changed the else to test if $new_file was there and I was able to purge grub-pc.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ucf 3.0032 [modified: usr/bin/ucf]
  ProcVersionSignature: Ubuntu 4.3.0-6.17-generic 4.3.3
  Uname: Linux 4.3.0-6-generic x86_64
  ApportVersion: 2.19.3-0ubuntu3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Jan 25 21:08:03 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-09-28 (118 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
  SourcePackage: ucf
  UpgradeStatus: Upgraded to xenial on 2016-01-06 (18 days ago)

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