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I have a number of USB devices (including a USB external HD) which will only be recognised by Ubuntu during boot.

For example:

If I plug in an RS232 device using a serial->USB device THEN boot Ubuntu /dev/ttyUSB0 is generated. However if I plug it in once Ubuntu is already booted, I don't get any /dev/ttyUSB0 until I reboot.

This is pretty annoying; is there anything I can run to get this to work?

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closed as off topic by Marco Ceppi Jan 11 '12 at 16:50

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

Most USB devices are hot-pluggable and will be detected by Ubuntu when you plug them and the computer is already on. So, I would look for errors of some kind. For a start, can you run sudo tail -f /var/log/syslog and post the lines that appear when you plug in/out a device that only works at boot? – Riccardo Murri Oct 12 '10 at 13:51
That sounds like a bug really... – JanC Oct 12 '10 at 14:00
Please file a bug about this - it seems like this is a bug specific to this device. (My RS232-USB adapter gives me a /dev/ttyUSB0 upon its insertion, although I have not tried it on 10.10.) – Broam Oct 12 '10 at 17:29
This question should instead be filed as a bug report, thanks! Instructions here. – Marco Ceppi Jan 11 '12 at 16:50