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dardo@dardo-desktop:~$ sudo add-apt-repository ppa:webupd8team/unstable

You are about to add the following PPA to your system:

 This PPA currently holds unreleased / git builds for different applications like Turpial, mc, Audacious.

 

PPA for WebUpd8: http://www.webupd8.org

 

 

 More info: https://launchpad.net/~webupd8team/+archive/ubuntu/unstable

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 551, in __bootstrap_inner

    self.run()

  File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 99, in run

    self.add_ppa_signing_key(self.ppa_path)

  File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 132, in add_ppa_signing_key

    tmp_keyring_dir = tempfile.mkdtemp()

  File "/usr/lib/python2.7/tempfile.py", line 322, in mkdtemp

    name = names.next()

  File "/usr/lib/python2.7/tempfile.py", line 141, in next

    letters = [choose(c) for dummy in "123456"]

  File "/usr/lib/python2.7/random.py", line 274, in choice

    return seq[int(self.random() * len(seq))]  # raises IndexError if seq is empty

ValueError: cannot convert float NaN to integer