[Bug 1276931] Re: d-r-u cancel mangles sources.list when sources.list.distUpgrade exists

[Brian Murray]

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Triaged

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

** Also affects: ubuntu-release-upgrader (Ubuntu Trusty)
   Importance: High
       Status: Triaged

** Changed in: ubuntu-release-upgrader (Ubuntu Trusty)
    Milestone: None => ubuntu-14.04.1

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https://bugs.launchpad.net/bugs/1276931

Title:
  d-r-u cancel mangles sources.list when sources.list.distUpgrade exists

Status in “ubuntu-release-upgrader” package in Ubuntu:
  Triaged
Status in “ubuntu-release-upgrader” source package in Trusty:
  Triaged

Bug description:
  ubuntu-release-upgrader (1:0.205.4), on a fully updated saucy system.
  When running `do-release-upgrade -d`, it found my non-standard
  sources.list (I run a local caching proxy mirror):

  ---
  Updating repository information

  No valid mirror found

  While scanning your repository information no mirror entry for the
  upgrade was found. This can happen if you run an internal mirror or
  if the mirror information is out of date.

  Do you want to rewrite your 'sources.list' file anyway? If you choose
  'Yes' here it will update all 'saucy' to 'trusty' entries.
  If you select 'No' the upgrade will cancel.

  Continue [yN] N

  Restoring original system state

  Aborting
  ---

  Upon exiting, /etc/apt/sources.list was all raring entries.  Turns
  out, this was the contents of /etc/apt/sources.list.distUpgrade, which
  existed before I ran d-r-u (no idea why, presumably something to do
  with quantal->raring or raring->saucy).

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