Comment 22 for bug 460857

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tz (thomas-mich) wrote :

My error - you should do lsof -i | grep /dev/ttyUSB0 to see if anything is holding.

If you add "proposed", (in the system->admin->software sourcest) you can get:

Linux tz-hpmini 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 16:20:31 UTC 2009 i686 GNU/Linux

which works for me.