The Eye of Gnome program (default image viewer in Ubuntu) has a "Print" dialog with a "Page Setup" page which contains a greyed out orientation option (along with greyed out paper size options and others). These options are available (and can be changed) under the "Page Setup" dialog from the "File" menu. However it is very unintuitive to have these options disabled in the "Page Setup" page of the "Print" dialog available from the "File" menu. This is a usability bug.

Evince recently has the same issue and corrected it under the (Ubuntu) bug https://bugs.launchpad.net/ubuntu/+source/evince/+bug/480895

This is 100% reproducible on Lucid with Eye of GNOME version 2.30.0 (package version 2.30.0-0ubuntu1).

Step to reproduce:
1. Open an image (say a JPEG) in Eye of Gnome by double clicking on the image file (or explicitly with Eye of Gnome).
2. Click File -> Page Setup. Here you can see the enabled options to change the page orientation (and other settings such as paper size). Do not change anything here, just notice the options are available then close the "Page Setup" dialog box.
3. Click File -> Print. In the dialog box that appears click the "Page Setup" page. In this page you can see the same options as in the other dialog box (in step 2) but they are disabled.

I expect in step 3 that these options are available and can be changed in the "Page Setup" page of the "Print" dialog.

This can be confusing and users may think you cannot change the orientation if the user did not notice the "Page Setup" option under the "File" menu.

This bug is also reported in Ubuntu at https://bugs.launchpad.net/ubuntu/+source/eog/+bug/598064