Calibre 2.58 appears to be a small bug fix release that finally brings compatibility with the latest Qt 5.x technologies (Qt 5.5 or later) on the Ubuntu Linux operating systems. This means that, if you use Calibre on Ubuntu, you should notice that the context menu of the Book List feature won’t flicker anymore.

Among several other fixes for bugs that have been reported by users since last month’s Calibre 2.57.1 release, we can mention support for the PyQt 5.6 library, the ability to import words into the user-defined dictionary again, and support for non-ASCII characters in identifier rules. Moreover, there are also a couple of new features.