[Bug 900556] [NEW] editing "backports" in Software Sources UI fails in odd ways

[Forest]

Public bug reported:

After upgrading from natty to oneiric, Synaptic's Software Sources UI
showed the backports repository as disabled, with the name "Unsupported
updates". Editing that entry (and its matching Source Code entry) to
change the distribution field from "natty-backports" to "oneiric-
backports" made it disappear from the Other Software tab entirely.

Exiting, replacing /etc/apt/sources.list.save* with backup copies, and
then returning to the Software Sources UI restored the entries, but
editing them again leaves my changes unsaved.  The UI accepts my
changes, but when I check the source again I see that the distribution
field is still "natty-backports".

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/900556

Title:
  editing "backports" in Software Sources UI fails in odd ways

Status in “software-properties” package in Ubuntu:
  New

Bug description:
  After upgrading from natty to oneiric, Synaptic's Software Sources UI
  showed the backports repository as disabled, with the name
  "Unsupported updates". Editing that entry (and its matching Source
  Code entry) to change the distribution field from "natty-backports" to
  "oneiric-backports" made it disappear from the Other Software tab
  entirely.

  Exiting, replacing /etc/apt/sources.list.save* with backup copies, and
  then returning to the Software Sources UI restored the entries, but
  editing them again leaves my changes unsaved.  The UI accepts my
  changes, but when I check the source again I see that the distribution
  field is still "natty-backports".

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