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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

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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
1  
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

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