[Bug 1821734] Re: Generated Launchpad URL to changelog is incorrect when a binary package version isn't the same as its source package version

[Robie Basak]

*** This bug is a duplicate of bug 655917 ***
    https://bugs.launchpad.net/bugs/655917

This presumably affects Xenial since 1.66.21+2.02~beta2-36ubuntu3.21 is
published in xenial-proposed only currently. The latest version of
update-manager on Xenial at the moment is 1:16.04.15 from xenial-
updates.

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https://bugs.launchpad.net/bugs/1821734

Title:
  Generated Launchpad URL to changelog is incorrect when a binary
  package version isn't the same as its source package version

Status in update-manager package in Ubuntu:
  New

Bug description:
  As reported by Luke at https://lists.ubuntu.com/archives/ubuntu-
  release/2019-March/004738.html:

  update-manager assumes that it can generate a Launchpad +changelog URL
  from a binary package version, instead of mapping from the
  corresponding source package version. In cases where these aren't the
  same, the URL 404s.

  Luke's example is:

  > "Changes for grub-efi-amd64-signed versions:
  > Installed version: 1.66.20+2.02~beta2-36ubuntu3.20
  > Available version: 1.66.21+2.02~beta2-36ubuntu3.21
  > 
  > The list of changes is not yet available.
  > 
  > Please use http://launchpad.net/ubuntu/+source/grub2-signed/1.66.21+2.02~beta2-36ubuntu3.21/+changelog 
  > until the changes become available or try again later."

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