Comment 3 for bug 852003

Software Center not show any error when started it silently failed to launch, which is a second error, if it showed me the error I could have known to fix this.

2012-01-26 15:43:58,292 - softwarecenter.ui.gtk3.em - INFO - EM's: 16 13 18
Traceback (most recent call last):
  File "/usr/bin/software-center", line 151, in <module>
    app = SoftwareCenterAppGtk3(datadir, xapian_base_path, options, args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 213, in __init__
    self.cache.open()
  File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 209, in open
    self._cache = apt.Cache(GtkMainIterationProgress())
  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 93, in __init__
    self.open(progress)
  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 140, in open
    self._list.read_main_list()
SystemError: E:Opening /etc/apt/sources.list.d/private-ppa.launchpad.net_commercial-ppa-uploaders_ubuntu-font-beta-testing.list - ifstream::ifstream (13: Permission denied)