I am an Ubuntu 14.04 User, and I was trying to install Ubuntu on my tablet following the official instructions (https://developer.ubuntu.com/en/start/ubuntu-for-devices/installing-ubuntu-for-devices/), but when I tried to use adb for the android backup with this command:
$ adb backup -apk -shared -all
or for unlocking the tablet with this other one:
$ adb reboot bootloader
I got this: "error: device not found".
When I write down this one:
& adb devices
I get nothing. Nevertheless, the tablet appears as connected (in the tablet and the laptop).
I was wondering if anyone knows how to solve this. I am still pretty new with Ubuntu, and I haven't found any type of solution yet although I have been trying many different options.
By the way, the tablet is a BQ Maxwell 2 Plus (with Andorid 4.1.1), if it is important to know.
P.D.: I tried to connect my phone too. This time with root permissions (sudo), but it was also not found (BQ Aquaris E5 HD with Android 5.0).