Ubuntu
ubuntu-themes package

  1. Bug #993275
  2. Comment #4

Comment 4 for bug 993275

Revision history for this message
Párkányi, Balázs (balazs-fang-deactivatedaccount) wrote : Re: ambiance theme not loaded

Perhaps this helps to find out what happened:
Yesterday after installing subtitlecomposer package, two png became unrecognizable: close_focused_normal.png and closed.png. After removing it, the two files became recognizable again.