Cannot open serial device /dev/ttyUSB0

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Steve Markgraf steve at
Wed Jun 5 18:19:57 UTC 2013


On 04.06.2013 19:40, George Andguladze wrote:
> Cannot open serial device /dev/ttyUSB0
> What is it that I am doing wrong?

If you're using a recent version of Ubuntu/Debian, modem-manager opens
serial devices when connected and probes for a modem.
Also, on older versions of Ubuntu brltty might block the port.

To work around the modem-manager issue either uninstall it, or put a
udev blacklist rule in place (where you insert the VID/PID of your


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