Some acer laptops (and Medion in Germany) have special keys e.g. to activate WiFi, but these keys are not detected.
From Linux kernel 3.2 or Lubuntu 12.04 there is a core module wistron_btns, offering the same functionality as before acerhk (not needed anymore).
wistron_btns has the advantage that it is part of the kernel. So installing and compiling is not needed. And 64 Bit systems are supported as well.
To use and activate open a terminal and execute:
sudo modprobe -v wistron_btns (enter)
Taken from: http://wiki.ubuntuusers.de/Acer_Hotkeys
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apt-offline - update computer offline
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WiFi cards will not be detected