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I installed ubuntu for the first time (first time ever using linux) i used my friends wireless card to update but when i got home and put in my wireless card it asks me for a password i put in my password, it tries to connect for 20-40 seconds and then it asks again for password.. and every other device i have has had no problem connecting with the same password and network?

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You need to provide more details, i.e. network card model, some relevant logs, configuration, etc. – Andrejs Cainikovs May 22 '12 at 19:58
Try to remove your wireless connection, Ubuntu will recreate it. You can do that in Network Indicator. – Basharat Sialvi May 22 '12 at 20:24
This happens to me whenever I have a weak wireless connection, and is highly annoying. If I leave my machine on overnight and return, I may have 50 popup windows asking me for the password. Model is zareason strata pro – cboettig Jun 20 '12 at 21:55
Is your network encrypted? That will happen if you're on hardware that (or its driver) doesn't support your encryption protocol. – Kyle Sep 18 '12 at 18:41

If you are able to change your wireless router's settings, examine the Channel Width and Mode. I find that some network cards, particularly those with older chipsets, have trouble making and maintaining connections to routers with a Channel Width of 40MHz (or a router set to auto, which can adjust itself among multiple widths). For me, the solution was to change Channel Width to 20MHz.

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Open Network Connections

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Got to the «Wireless» tab and choose your net. Enter the BSSID. It is something like «00:11:22:33:44:55»

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Finally, check the «Wireless Security» tab. The most common security protocol is WEP (Hex or ASCII), but you can try other options.

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