Не удается установить Firefox в Semplice Linux

Я использую Semplice Linux в VMware в Windows 7. Он отлично работает, но я не могу установить Firefox.

Semplice Linux основан на Debian Sid (нестабильной ветке) с рабочим столом Openbox.

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Это то, что я получаю

sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa You are about to add the following PPA to your system: daily (or even multiple builds per day) for various mozilla projects and branches. For questions and bugs with software in this archive, please contact <email address hidden> or visit #ubuntu-mozillateam on freenode. More info: https://launchpad.net/~ubuntu-mozilla-daily/+archive/ubuntu/ppa Press [ENTER] to continue or ctrl-c to cancel adding it Traceback (most recent call last): File "/usr/bin/add-apt-repository", line 167, in <module> sp = SoftwareProperties(options=options) File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 105, in __init__ self.reload_sourceslist() File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 595, 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 Semplice/heaven 

EDIT :

После добавления источников, как указано в ответе, я получаю следующее:

 W: Failed to fetch http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu/dists/unstable/main/source/Sources 404 Not Found W: Failed to fetch http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu/dists/unstable/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. c@c-semplice:~$ sudo apt-get install firefox Reading package lists... Done Building dependency tree Reading state information... Done Package firefox is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'firefox' has no installation candidate 

 deb http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu unstable main deb-src http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu unstable main