Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", line 572, in on_category_activated
    vm.display_page(self, page, self.state, callback)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/session/viewmanager.py", line 151, in display_page
    self.navhistory.append(nav_item)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/session/navhistory.py", line 41, in append
    LOG.debug("appending: '%s'" % nav_item)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/session/navhistory.py", line 116, in __str__
    state = unicode(self.view_state).encode('utf-8')
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 25: ordinal not in range(128)