Comment 3 for bug 548398

One simple way to keep the UI alive is:

=== modified file 'DistUpgrade/DistUpgradeCache.py'
--- DistUpgrade/DistUpgradeCache.py 2010-04-12 14:47:37 +0000
+++ DistUpgrade/DistUpgradeCache.py 2010-04-12 16:26:24 +0000
@@ -574,7 +574,16 @@

     # FIXME: make this a decorator (just like the withResolverLog())
     def updateGUI(self, view, lock):
+ progress = view.getOpCacheProgress()
+ i = 0
+ step = 1
         while lock.locked():
+ i += step
+ progress.update(i)
+ if i == 100:
+ step = -1
+ elif i == 0:
+ step = 1
             view.processEvents()
             time.sleep(0.03)

but for some reason this seems to crash on the qt frontend of the release upgrader (segfault deep in libqt).