(it is likely this will improve in later Debian releases) the 11 inch screen models (AO751h) are partially supported in lenny: the wired driver works and can be used for the installation although the installation will give you a working laptop, however many changes will be needed to get all hardware working (including the maximum 1366 x 768 resolution which is not supported by the lenny x.org).the second generation 10 inch screen models (A250) include unsupported wired Ethernet adapters (is this still true, or which is not natively supported) - you will need to install using the wireless card, and if needed, compile the wired network module later on.the original 9 inch screen models (numbered A110, A150) are well supported.Note that there are several versions of the Acer Aspire One: Enable Hardware Acceleration in Adobe Flash Plugin.Stop Firefox from Loading Pages in the Background.Reducing Disk Access for laptops with SSDs.Screen resolution: 9 and 10 inch models.

Formatting your drive with additional software for booting.