[ubuntu] Have to reset router a lot

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http://ubuntuforums.org – hello all, I just installed 10.04 on my parents computer and they are loving it, but one problem has been happening which wasn't happening under windows. They are using an external USB wifi connector which i had been using on my network with a linux machine, so i know it works fine. The problem is that about every 5th time they boot the computer it doesnt make a network connection, the LINK light on the usb wifi device doesnt blink and the indicator for NETWORK MANAGER just spins in circles. They then have to reset the router and reboot(yes reboot not just try to connect again) the computer. (HowTos)