PPA description breaks add-apt-repository

[Mike Williamson]

With the description:

The excellent Mario Bros./Portal mash up from http://stabyourself.net/mari0.
You will need to install love-unstable from the following ppa to run the game: https://launchpad.net/~bartbes/+archive/love-unstable

We get the following error when trying to add the repo:

mike@sleepycat:~$ sudo add-apt-repository ppa:sleepycat/mari0
[sudo] password for mike:
You are about to add the following PPA to your system:
 mari0
 The excellent Mario Bros./Portal mash up from http://stabyourself.net/mari0.
You will need to install love-unstable from the following ppa to run the game: https://launchpad.net/~bartbes/+archive/love-unstable
 More info: https://launchpad.net/~sleepycat/+archive/mari0
Press [ENTER] to continue or ctrl-c to cancel adding it

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 95, in run
    self.add_ppa_signing_key(self.ppa_path)
  File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 117, in add_ppa_signing_key
    "--recv", signing_key_fingerprint])
  File "/usr/lib/python2.7/subprocess.py", line 493, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1239, in _execute_child
    raise child_exception
TypeError: execv() arg 2 must contain only strings

Change the description to:

The excellent Mario Bros Portal mash up from stabyourself.net

And the result:

mike@sleepycat:~$ sudo add-apt-repository ppa:sleepycat/mari0
[sudo] password for mike:
You are about to add the following PPA to your system:
 mari0
 The excellent Mario Bros Portal mash up from stabyourself.net
 More info: https://launchpad.net/~sleepycat/+archive/mari0
Press [ENTER] to continue or ctrl-c to cancel adding it

Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.9qXjlYSvb1 --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://keyserver.ubuntu.com:80/ --recv 86E6465FC65DCD46FDD012DA7AFCCFD05C32BF25
gpg: requesting key 5C32BF25 from hkp server keyserver.ubuntu.com
gpg: key 5C32BF25: public key "Launchpad PPA for Mike Williamson" imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)

[Robert Roth (evfool)]

Can you still reproduce this? I have tried adding the PPA in question, and adding it has worked without any problems.

[Robert Roth (evfool)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug #968756, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.