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When at the Grub screen for the Ubuntu Live CD you can choose options (by pressing F6) and select an option called pci=off.

What does that mean? How will it change how Ubuntu boots?

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From the Linux BootPrompt Howto:

pci=off:

Using this option disables all PCI bus probing. Any device drivers that make use of PCI functions to find and initialize hardware will most likely fail to work.

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  • Thank you. If I install Ubuntu with that option, I want it will recognized my wireless card. How I do it?
    – Tal
    Commented Jun 20, 2014 at 9:23
  • The default is that probing takes place in the PCI BIOS and I would let it so, that all devices are recogized. So don't use the pci=off boot option and your wireless card will be recognized.
    – chaos
    Commented Jun 20, 2014 at 9:40
  • But I can't. If i don‘t use this option, the Ubuntu 14.04 will not load (the live image). I need a solution after installation.
    – Tal
    Commented Jun 20, 2014 at 9:46
  • @Tal it's ok to boot the live image this way. This is just the boot option for the live system, not for the installation afterwards.
    – chaos
    Commented Jun 20, 2014 at 9:51
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    Not connected, disabled, broken or not recognized by the BIOS, can be many faults. In the installed system, when you type lspci in the terminal and there is a entry starting with Network controller: blah blah Wireless blah blah, and iwconfig shows the wireless card, then your card is recognized and running.
    – chaos
    Commented Jun 20, 2014 at 9:57

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