Cannot open serial device /dev/ttyUSB0

George Andguladze gandguladze at
Tue Jun 11 08:07:19 UTC 2013

Hi Steve,

Thanks for help, but ModemManager doesn't seem to be an issue. Question: Does "Cannot open serial device /dev/ttyUSB0" error mean that 
it is unable to connect to my USB adapter or that there might not be a phone connected on the other end of the adapter?


> Date: Wed, 5 Jun 2013 20:19:57 +0200
> From: steve at
> To: gandguladze at
> Subject: Re: Cannot open serial device /dev/ttyUSB0
> CC: baseband-devel at
> Hi,
> 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
> adapter):
> Regards,
> Steve
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