"adb devices", "offline" device

[hotfinger]

Hello everyone.
When trying to see if Ubuntu 14.04 communicates with my Nexus 5 by "adb devices", goes "offline" and I can not make it connect. I've done everything I've found online about: udev restart, reboot the device, highlight the USB debugging mode, "adb kill-server" and "sudo adb start-server" ... of course create a file "adb_usb.ini" and include "51-android.rules". This happens to me after root the Nexus 5 with CF-Auto-Root. Do you have something to do?
See if you can help me fix it. I do not know what to do.
Thank you.
Greetings.

 

[Rukbat]

This happens to me after root the Nexus 5 with CF-Auto-Root. Do you have something to do?

To find out, boot the phone into recovery mode. (I'm assuming that USB debugging mode in the phone is checked, not "highlighted".)

 

[hotfinger]

Excuse my English. When I said "Do yo have something to do?" I meant "Does it have something to do?".

 

[Rukbat]

Does it have something to do with CF-Auto-Root? It's possible, but thousands of people have used it with no problem, so I would think it's more likely that it doesn't.