[Bug 1509702] [NEW] add-apt-repository adds same repository multiple times

[moma]

Public bug reported:

Hello,
I am running Ubuntu 15.10 and noticed that add-apt-repository adds the same source-repository multiple times.  
I have accidentally run the add-apt command several times.

$ sudo add-apt-repository  ppa:audio-recorder/ppa

A screenshot.
[url=http://bildr.no/view/ZktOZDRI][img]http://bildr.no/thumb/ZktOZDRI.jpeg[/img][/url]

I have one `audio-recorder-ubuntu-ppa-wily.list` file in /the
etc/apt/sources.list.d/  folder:

$  cat /etc/apt/sources.list.d/audio-recorder-ubuntu-ppa-wily.list

deb http://ppa.launchpad.net/audio-recorder/ppa/ubuntu wily main
# deb-src http://ppa.launchpad.net/audio-recorder/ppa/ubuntu wily main
# deb-src http://ppa.launchpad.net/audio-recorder/ppa/ubuntu wily main
# deb-src http://ppa.launchpad.net/audio-recorder/ppa/ubuntu wily main
-----

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 15.10
Release:	15.10     Codename:	wily

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: software-properties-gtk 0.96.13
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Oct 24 19:43:44 2015
InstallationDate: Installed on 2015-10-19 (4 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20151017)
PackageArchitecture: all
SourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug wily

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https://bugs.launchpad.net/bugs/1509702

Title:
  add-apt-repository adds same repository multiple times

Status in software-properties package in Ubuntu:
  New

Bug description:
  Hello,
  I am running Ubuntu 15.10 and noticed that add-apt-repository adds the same source-repository multiple times.  
  I have accidentally run the add-apt command several times.

  $ sudo add-apt-repository  ppa:audio-recorder/ppa

  A screenshot.
  [url=http://bildr.no/view/ZktOZDRI][img]http://bildr.no/thumb/ZktOZDRI.jpeg[/img][/url]

  I have one `audio-recorder-ubuntu-ppa-wily.list` file in /the
  etc/apt/sources.list.d/  folder:

  $  cat /etc/apt/sources.list.d/audio-recorder-ubuntu-ppa-wily.list

  deb http://ppa.launchpad.net/audio-recorder/ppa/ubuntu wily main
  # deb-src http://ppa.launchpad.net/audio-recorder/ppa/ubuntu wily main
  # deb-src http://ppa.launchpad.net/audio-recorder/ppa/ubuntu wily main
  # deb-src http://ppa.launchpad.net/audio-recorder/ppa/ubuntu wily main
  -----

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 15.10
  Release:	15.10     Codename:	wily

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: software-properties-gtk 0.96.13
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Oct 24 19:43:44 2015
  InstallationDate: Installed on 2015-10-19 (4 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20151017)
  PackageArchitecture: all
  SourcePackage: software-properties
  UpgradeStatus: No upgrade log present (probably fresh install)

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