since I installed ubuntu on my lenovo I can only get wireless internet for about 5 minutes after I restart my computer, and then it just stops responding. My network security is WEP and ethernet connection is good. I'd be great to fix this issue.
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I believe this has been answered before.
First, open a Terminal window (Ctrl Alt T), then type the following:
rfkill list
If it shows up to be softblocked, then try:
rfkill unblock all
If it shows up to be hardblocked and any and all wireless switches on your laptop are ON, then there is a conflict between Linux and your BIOS. I have such a conflict on my own Toshiba Satellite, and solved it with the following steps:
First, make sure your Wi-Fi (or any wireless) switch is ON before booting. The BIOS will see it on and leave it that way. Never use 'Fn + F8' or any other methods to turn off the wireless. Use Ubuntu's built-in soft methods instead - that is, by clicking on the icon in the top-left of your screen.