Ubuntu 13.10 adb "device not found" I'm trying to reinstall Android on my first-gen Nexus 7. I'm using adb to do so because the install is so corrupted I can't even use the touch screen.

I use Ubuntu 13.10 and I have adb and fastboot installed. My Nexus is plugged in. This is what I type:

sudo adb kill-server
sudo adb start-server
adb devices


And... nothing shows up. How do I fix this?
Try running "sudo adb devices". Or, fix your udev rules so that the USB device is writable by your user (see the link in caffinatedmonkey's comment)