GNOME Bugzilla – Bug 490575
Calibration of screen doesn't work
Last modified: 2008-10-30 20:02:41 UTC
This bug has been reported on Ubuntu : https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/157480 I think it affects GIMP more than Ubuntu packaging. Don't hesitate to ask questions on Launchpad or here, I will relay the messages.
This is a misunderstanding. The user needs to uncheck "Dot for Dot" in the View menu. There's also a gimprc option to change the default for this.