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Ubuntu 14.04 doesn't recognize any of my Android devices anymore. (Tried with the Nexus 7 and Galaxy Nexus)

I thought this was an MTP or ADB-problem, but connecting / disconnecting the devices doesn't even change the output of lsusb or dmesg at all.

It's like the devices aren't even plugged-in. However they both charge normally, when I plug them in, so I can't imagine having a cable-problem or a problem with the android devices themselves.

(I've tried it with usb-debugging on and off on both devices - no difference)

I have problems with my Ubuntu GNOME 14.04 installation recognizing my Nexus 7 at times, too. This is what works for me:

1. Make sure the cable can transfer information, that it's not just a power cable.


2. Make sure you have USB debugging enabled.


3. Unlock your device.


4. Connect your device to your computer.


5. Your device should display a pop-up, asking if you want to accept a connection to your computer. (If you had this pop-up before, you might have ticked the "always accept a connection from this device" checkbox.)


6. Normally, your device should now pop up in your favorite file manager. If it doesn't, check if ADB finds your device. In a terminal, type adb devices (you might need to be root).


7. If ADB lists your device, go to Settings > Storage and select the options button in the upper right corner:

8. Select the file sharing option you want:

if dmesg doesn't report any change, it's definitively a cable problem or in the worst case a problem with the microUSB port of the Android devices

To set up device detection on Ubuntu Linux:

Log in as root and create this file: /etc/udev/rules.d/51-android.rules.

Use this format to add each vendor to the file:

SUBSYSTEM=="usb", ATTR{idVendor}=="0bb4", MODE="0666", GROUP="plugdev"

In this example, the vendor ID is for HTC. The MODE assignment specifies read/write permissions, and GROUP defines which Unix group owns the device node.

Now execute:

 sudo chmod a+r /etc/udev/rules.d/51-android.rules

From developer.android.com/studio/run/device.html

The problem was ultimately the cable.

Some USB cables are just for charging. Other cables also support data. I tried 3-4 different cables, until one of them ultimately worked.

That was the reason, why connecting the phone didn't even register with dmesg at all.

To use the android phones in Ubuntu, developer mode must be enabled.

1.First you must go to setting on your android and scroll down to "About phone." Tap it.

2.Scroll down to the bottom again, where you see "Build number." (Your build number may vary from ours here.)

3.Tap it seven (7) times.

4.After that a new item in the setting appear which is ({}developer options)tap it .... Under debugging you see USB debugging check it now ubuntu 14.04 should see your device enjoy....

As Organic Marble correctly said, you need to create a file /etc/udev/rules.d/51-android.rules with one or more of the following lines:

SUBSYSTEM=="usb", ATTR{idVendor}=="0502", MODE="0666", GROUP="plugdev" #Acer

SUBSYSTEM=="usb", ATTR{idVendor}=="0b05", MODE="0666", GROUP="plugdev" #ASUS

SUBSYSTEM=="usb", ATTR{idVendor}=="413c", MODE="0666", GROUP="plugdev" #Dell

SUBSYSTEM=="usb", ATTR{idVendor}=="0489", MODE="0666", GROUP="plugdev" #Foxconn

SUBSYSTEM=="usb", ATTR{idVendor}=="04c5", MODE="0666", GROUP="plugdev" #Fujitsu

SUBSYSTEM=="usb", ATTR{idVendor}=="04c5", MODE="0666", GROUP="plugdev" #Fujitsu Toshiba

SUBSYSTEM=="usb", ATTR{idVendor}=="091e", MODE="0666", GROUP="plugdev" #Garmin-Asus

SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", MODE="0666", GROUP="plugdev" #Google

SUBSYSTEM=="usb", ATTR{idVendor}=="201E", MODE="0666", GROUP="plugdev" #Haier

SUBSYSTEM=="usb", ATTR{idVendor}=="109b", MODE="0666", GROUP="plugdev" #Hisense

SUBSYSTEM=="usb", ATTR{idVendor}=="0bb4", MODE="0666", GROUP="plugdev" #HTC

SUBSYSTEM=="usb", ATTR{idVendor}=="12d1", MODE="0666", GROUP="plugdev" #Huawei

SUBSYSTEM=="usb", ATTR{idVendor}=="24e3", MODE="0666", GROUP="plugdev" #K-Touch

SUBSYSTEM=="usb", ATTR{idVendor}=="2116", MODE="0666", GROUP="plugdev" #KT Tech

SUBSYSTEM=="usb", ATTR{idVendor}=="0482", MODE="0666", GROUP="plugdev" #Kyocera

SUBSYSTEM=="usb", ATTR{idVendor}=="17ef", MODE="0666", GROUP="plugdev" #Lenovo

SUBSYSTEM=="usb", ATTR{idVendor}=="1004", MODE="0666", GROUP="plugdev" #LG

SUBSYSTEM=="usb", ATTR{idVendor}=="22b8", MODE="0666", GROUP="plugdev" #Motorola

SUBSYSTEM=="usb", ATTR{idVendor}=="0e8d", MODE="0666", GROUP="plugdev" #MTK

SUBSYSTEM=="usb", ATTR{idVendor}=="0409", MODE="0666", GROUP="plugdev" #NEC

SUBSYSTEM=="usb", ATTR{idVendor}=="2080", MODE="0666", GROUP="plugdev" #Nook

SUBSYSTEM=="usb", ATTR{idVendor}=="0955", MODE="0666", GROUP="plugdev" #Nvidia

SUBSYSTEM=="usb", ATTR{idVendor}=="2257", MODE="0666", GROUP="plugdev" #OTGV

SUBSYSTEM=="usb", ATTR{idVendor}=="10a9", MODE="0666", GROUP="plugdev" #Pantech

SUBSYSTEM=="usb", ATTR{idVendor}=="1d4d", MODE="0666", GROUP="plugdev" #Pegatron

SUBSYSTEM=="usb", ATTR{idVendor}=="0471", MODE="0666", GROUP="plugdev" #Philips

SUBSYSTEM=="usb", ATTR{idVendor}=="04da", MODE="0666", GROUP="plugdev" #PMC-Sierra

SUBSYSTEM=="usb", ATTR{idVendor}=="05c6", MODE="0666", GROUP="plugdev" #Qualcomm

SUBSYSTEM=="usb", ATTR{idVendor}=="1f53", MODE="0666", GROUP="plugdev" #SK Telesys

SUBSYSTEM=="usb", ATTR{idVendor}=="04e8", MODE="0666", GROUP="plugdev" #Samsung

SUBSYSTEM=="usb", ATTR{idVendor}=="04dd", MODE="0666", GROUP="plugdev" #Sharp

SUBSYSTEM=="usb", ATTR{idVendor}=="054c", MODE="0666", GROUP="plugdev" #Sony

SUBSYSTEM=="usb", ATTR{idVendor}=="0fce", MODE="0666", GROUP="plugdev" #Sony Ericsson

SUBSYSTEM=="usb", ATTR{idVendor}=="2340", MODE="0666", GROUP="plugdev" #Teleepoch

SUBSYSTEM=="usb", ATTR{idVendor}=="0930", MODE="0666", GROUP="plugdev" #Toshiba

SUBSYSTEM=="usb", ATTR{idVendor}=="19d2", MODE="0666", GROUP="plugdev" #ZTE

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