I somehow messed up my android studio configuration. At least "adb" is not working anymore, which leads to the fact that I cannot see my connected phone for USB debugging.
Adb gives a "permission denied" and following the respective stackoverflow recommendations did not solve my problem (installing 32bit libraries, downloading older Android Studio version, chmod +x on adb)
Now I just want a clean new installation. But even that ends in the same error.
I already deleted 2 folders in my home directory (.android and .AndroidStudio4.0)
UpdateI could at least install Android adb globally using
sudo apt update
sudo apt-get install android-tools-adb android-tools-fastbootwhich works inside the console and also lists my connected phone. However back in Android studio the phone is still not listed for debugging
11 Answer
I finally fixed my setup. The steps involve
sudo apt-get remove android-tools-adb android-tools-fastbootthen again delete
/home/user/.android
/home/user/.AndroidStudio4.0My hunch is that the real culprit was that my android Sdk folder was not installed on my home partition
/home/user/AndroidInstead I used a symbolic link to point to some larger partition (This setup used to work fine in the past, however).
Sorry for the unenlightening answer