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USB problems with Ubuntu 12.04

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http://askubuntu.com – I got 2 problems with my USB drive and I badly need a solution asap for these plz help me out. My usb devices run very slow in ubuntu.Though I have 1.1 ports on my laptop, I used to get speed of 20-25 mbps for my seagate usb hardisk while using windows. But in ubuntu uits hardly 500-800kbps.The problem persists with pen drives and usb mouse etc. Secondly, ubuntu does not recognize my usb devices unless inserted before boot. I am not able to find them in lsusb output even if inserted after the boot. thanks in advance (HowTos)