New answers tagged mtp
This worked for me on Ubuntu 14.04: On the Android device, under Settings->Networking, select USB Configuration and change it from "Charging" to "MTP" (Media Transfer Protocol) No more pop-ups!
I just had exactly the same error but with my ASUS Zenfone 2 on Xubuntu 15.10. I tried a different USB port (3.0) and it just worked, I suspect the MTP setting wants a better port. Either that or there is something wrong with my USB 2.0 port (and the OPs port) You could try a different port - on a different PC if you have to.
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