At least on Apple’s iBook, LXDE/LXDM are not yet recommended. Even though I appreciate lean desktop environments with keyboard shortcuts there are at least these issues:
I recently upgraded my iPhone 5 to an Optimus G, which fits better to the profile of a Linux User and after I was never satisfied with the results of Siri (at least in German), the voice recognition of Google Now is in comparison more than convincing.
The Huawei E220/E270 stick I got from my mobile provider is working on Ubuntu Lucid Lynx out-of-the-box.
Upgrading all the gear to the newest Ubuntu release also includes Apple’s iBook.
It took some time, but was in the end straightforward.
Only 2 issues are currently worth mentioning, one about
chvt, the other about Gnome Keyring.
A few days ago I managed to connect a new power adapter to the iBook G4 to reanimate it after more than a year of deep freeze.
I soon realized that the installed MacOS is definitely out-of-date including many of the applications (e.g. Safari, Firefox, iPhoto).
Since an upgrade would not only cost money, but the latest MacOS is no longer available for this architecture, I downloaded the unofficial Ubuntu PPC release.