could not find a distribution template for elementary OS/isis

Looks like we'll have to port our Luna patch to Isis, both to python-apt and python3-apt. That should fix it.

The error above was occurring when using the unpatched package. With the patched package I get another error:

$ software-properties-gtk
Traceback (most recent call last):
  File "/usr/bin/software-properties-gtk", line 37, in <module>
    from softwareproperties.gtk.SoftwarePropertiesGtk import SoftwarePropertiesGtk
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 51, in <module>
    from softwareproperties.SoftwareProperties import SoftwareProperties
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 57, in <module>
    from . import shortcuts
  File "/usr/lib/python3/dist-packages/softwareproperties/shortcuts.py", line 23, in <module>
    _DEF_CODENAME = aptsources.distro.get_distro().codename
  File "/usr/lib/python3/dist-packages/aptsources/distro.py", line 490, in get_distro
    codename = result['Suite']
KeyError: 'Suite'

 _DEF_CODENAME = aptsources.distro.get_distro().codename
  File "/usr/lib/python3/dist-packages/aptsources/distro.py", line 490, in get_distro
    codename = result['Suite']
KeyError: 'Suite'

i think it should be ['Codename']
thats what i read on chat

The fix should land to PPA in a few hours.

I realize this is an old thread, but currently receiving the same error:

Traceback (most recent call last):
  File "/usr/bin/add-apt-repository", line 91, in <module>
    sp = SoftwareProperties(options=options)
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 109, in __init__
    self.reload_sourceslist()
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 599, in reload_sourceslist
    self.distro.get_sources(self.sourceslist)
  File "/usr/lib/python3/dist-packages/aptsources/distro.py", line 89, in get_sources
    (self.id, self.codename))
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Ubuntu/n/a

Command line lsb_release -a reports:

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.4 LTS
Release: 14.04
Codename: trusty

But I have "Elementary OS" installed. I'm not sure how this occurred but need to correct the problem. Because I am unable to add a new repository.
I also do if this is posted in the wrong place. Thank you for any assistance.

Same here, I've used gksudo to change /etc/lsb-release to Ubuntu, as well as elementary Freya, neither of the setups work, both throw up

"Error: could not find a distribution template for Ubuntu/n/a"