Error message in the terminal when I type in the terminal ‘adb devices’:
The popup message to authorize the usb connection does not appear on my phone.
I use Ubuntu Linux on my pc.
I tried different usb cables.
I switched between the different usb modes (MTP, PTP)
USB Debugging is active on my phone.
I tried with another pc (that has Linux Mint installed): the popup authorization does show up on my phone.
My first investigations:
I see something interesting here: https://android.stackexchange.com/questions/71761/how-to-regenerate-create-adbkey-and-adbkey-pub-from-the-command-line
I tried this:
cedric@cedric-Fujitsu:~$ ls ~/.android/
ls: cannot open directory ‘/home/cedric/.android/’: Permission denied