Hello may.
In order to help you, the developers would need to know more things like what 
driver does your card use, type of encryption in the network...
Please follow the steps in: https://wiki.ubuntu.com/DebuggingNetworkManager and 
post here your results!

May be useful: my friend had the same problem because the driver he was using 
sets the minimum speed rate to the device by default.
Try this command in a console and please tell us if it has worked for you. 
Thanks!

sudo iwconfig ath0 rate 54M

** Changed in: network-manager (Ubuntu)
       Status: New => Incomplete

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its so slow and i cant see my pictures on my space
https://bugs.launchpad.net/bugs/316210
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