Same problem in Karmic. The file transfer starts off well, but slows to
a crawl...

dmesg | grep usb
[  124.371817] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  130.340032] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  218.350034] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  368.340032] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  368.650033] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  388.340026] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  430.341309] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  462.340038] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  572.350050] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  676.340024] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  738.340024] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  808.340025] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  863.340021] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  881.350058] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[  884.350056] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[ 1014.340028] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[ 1040.410035] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[ 1044.350036] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[ 1057.340028] usb 1-9: reset high speed USB device using ehci_hcd and address 4
[ 1092.340027] usb 1-9: reset high speed USB device using ehci_hcd and address 4

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USB file transfers extremely slow and eventually cause kernel freezes
https://bugs.launchpad.net/bugs/183839
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