Comment 2 for bug 555828

I too was frustrated by this, having struggled for months to get my laptop wifi running on Ubuntu before discovering acerhk, only to be facing the same problem again! However, I discovered that Acerhk appears to be no longer maintained. Instead, use acer-wmi. I have tried out the following and it works in Lucid rc and Karmic - probably in earlier versions too as acer-wmi has been round for a while.

If you have acerhk, remove it with:

sudo modprobe -r acerhk

then install acer-wmi:

sudo modprobe acer-wmi

You should now be able to connect to your hub via Network Manager. On my FSC Amilo Li 2735, this works straight 'out of the box' on a fresh install with no ethernet connection, though some laptops possibly require extra drivers.

To tidy up, and make wifi run automatically at start-up:

sudo nano /etc/modules

Delete 'acerhk' if present, and add 'acer-wmi' (without apostrophes) to the bottom of the text. Press Ctrl + O, then press Enter, then Ctrl + X to save and close. I also used Synaptics to remove acerhk and acerhkgui