android - debugging app on xperia over Ubuntu -

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i'm trying debug application on xperia cellphone cyanogenmod installed, doesn't seem recognize cell phone. also, adb seems gone, followed http://developer.android.com/guide/developing/device.html official guide, when executing:

$./adb devices

on plataform-tools/ directory system doesn't recognize device.

also tried 

$sudo ./adb devices

any ideas?

thanks help.!! solved

the problem needed restart adb server did this:

$sudo ./adb kill-server $sudo ./adb start-server

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