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I have experienced most strange thing in Ubuntu last day. I have a Dell latitude laptop which i used in India with ubuntu 10.04 and windows 7 installed in it. I could connect to internet by using both wired and wireless interface in both os. Now i moved to France and have done nothing to it, but now i couldn't see any network interface in my ubuntu for both wired and wireless. Any idea?

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What do you mean by "you cannot see any network interface". Is it that you see no networks or that the interface is no longer configured? –  terdon Feb 21 '13 at 16:24
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when i type iwconfig and ifconfig it only shows lo, no ethernet drivers. previously eth0 was there for wired and eth1 for wireless.. –  user92153 Feb 21 '13 at 16:25

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Well, for Wireless you might have disabled it by the switch or a key combination. Try enabling it. If it doesn't work in Ubuntu, try it in Windows and restart to Ubuntu. Also check if it is disabled in the BIOS.

For wired, either Ubuntu tried to update the LAN driver and failed rendering that card invisible, or it is disabled in BIOS. If you know the model of the card (eg Realtek RTL-8111F) try at manufacturer's site for latest Linux driver. If I remember correctly, for Ubuntu you download the .deb version, if available. Of course you should download the 32-bit version for 32-bit Ubuntu and the 64-bit version for 64-bit Ubuntu. If lucky, by reinstalling the LAN driver, the card should come back to life.

I don't know about Ubuntu, but a utility for Windows to see which hardware components you have in a computer is former Everest, newer Aida64. It can tell you with detail even if no drivers are installed. This is useful if you face an unknown machine, so you know which drivers to download. At worst case you can see the vendor ID and device ID, Google it and find out which device is that. If you cannot find drivers at manufacturer's site, one good one is www.driverguide.com Be careful though as it may try installing unwanted software to give you the driver for free.

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i have enable it by key combination. The strange thing is no problem with windows still, but in ubuntu, no driver at all. It was there 2 months back, when i last used from india. –  user92153 Feb 21 '13 at 16:41
    
Regarding wireless: Which channels are configured? When moving across countries you can run to problems due to this: en.wikipedia.org/wiki/List_of_WLAN_channels –  Hennes Feb 21 '13 at 16:50
    
@Hennes that should not affect the detection of the wireless card itself, only the ability to connect to networks. –  terdon Feb 21 '13 at 16:54
    
What does "lspci" say? This should tell us if the OS is physically recognising the hardware. Also, what does "ifconfig eth0" say ? –  davidgo Feb 21 '13 at 18:52

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