Can you post the output of lsusb -v so we can check if your system thinks you have a USB 3.0 controller and USB 3.0 flashdrive, or whether it thinks one or both of them is USB 2.0?
Also, if you've upgraded from Ubuntu 14.04.4 LTS to a newer version please let us know. Finally, can you please (re)post the output of uname -srm ** Changed in: linux-lts-wily (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1564650 Title: Slow Transfer Rate USB, ext4, NTFS, fat32 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-wily/+bug/1564650/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs