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The Darktable PPA has now been updated, works on Natty.

http://blog.pcode.nl/2011/04/21/darktable-and-ubuntu-natty/
https://launchpad.net/~pmjdebruijn/+archive/darktable-release

Oops, missed that one. :) Well, hope that saves someone the trouble of reinstalling. :D

https://help.ubuntu.com/community/InstallingSoftware#Installing%20packages%20without%20an%20Internet%20connection

I had to get the packages first on a working system (dualboot), moved the .debs to...

I used the same method to fix the .ICEauthority issue, but I'm curious why it was issue in the first place. If someone has any pointers on possible reasons, please share :)

(...so, +1 on the "fix")

Check out http://ubuntuforums.org/showthread.php?t=828741 for a possible solution. Worked for my desktop.