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I got Atheros9485 802.11b/g/n Wifi Adapter and Ubuntu 12.04 but the driver isn't installed. I can't use 'Additional Drivers' since I'm not connected to a network nor have the driver.

So what can I do? I'm new so if someone can explain in detail I would be grateful.

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Your question is quite similar to "How can I install and download drivers without internet?", but only regarding a different networking device.

However, I think this is not going to solve your problem, since your device should be supported out of the box by the ath9k driver included in Ubuntu. Did you use an updated 12.04.1 image? That may resolve some issues. Try that out if you can't go online with that machine to run updates.

If that fails too, try using a workaround as explained here: "Ubuntu 12.04 wifi is not working (Atheros AR9485) [closed]"

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If you do not have a driver for the corresponding network card, then this is due to an unstable Internet connection. We need to know the driver version.

first we find out the name of the network interface:

# apt install net-tools

# ifconfig

find out the driver name:

# apt install ethtool

# ethtool -i eth0` # specify the name of your network interface

there will be something like:

driver: via-rhine
version: 1.5.1

To find out which driver is installed and detailed information about the card in the configuration section:

# apt install lshw

# lshw -class network

configuration: autonegotiation=on broadcast=yes driver=via-rhine
driverversion=1.5.1

then look for the driver using apt:

# apt search name-your-driver

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