ADB no device detected with Nexus 5

On my Nexus 5 (LineageOS 15.1 / Android 8.1), I can't see my device when typing adb devices (Manjaro with Android SDK 3.2.1). What I tried: 1. Root access: "ADB only" 2. Android debugging: "on" 3. Revoked USB authorizations 4. USB configuration: "MIDI"/"AUDIO"/"Charging"/"MTP"/"PTP" (tried each) 5. Restarted the device, and also connected after restarting 6. Changed USB Cable 7. Inserted udev rules (like on Arch Wiki ) 8. All of this in a root shell lsusb is not listing the device if I have Android debugging on. If it's off, I see it. (As soon as I switch it on, it disappears.) I don't have Windows at the time, so would this help? **What can I try next?** My goal was to install Ubuntu Touch in dual-boot mode.