Comment 17 for bug 775124

Patch created that looks for the seed files lubuntu.seed and xubuntu.seed to decide
whether this is an Lubuntu or Xubuntu install. If either one is found, the " * 2"
fudge factor that Evan added is reverted, and instead the filesystem.size value is
used, plus 600MB so there is some free space to use.

Comments, and especially testing, welcomed :)