Indeed, lots of USB port resets in
https://launchpadlibrarian.net/176813239/CurrentDmesg.txt. I suppose the
port that the hub is connected to is simply unable to provide enough
power for all devices on the hub, or there is a bad USB cable or other
hardware problem. Please try the USB device on a different USB port
that's connected directly to the computer; if the device has its own
power supply, try a different cable, or a different hub to isolate the
problem?

** Changed in: systemd (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1325757

Title:
  USB Hub does not mount the USB devices

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