Did you try restarting? As I say in my laptop the btusb module gets confused sometimes - messing with bluez/etc doesn't help at all.
Strange about the permissions backend for Web Bluetooth - never seen that one before!
permissions backend for Web Bluetooth
Otk, there seem to be two seperate problems. One with Kubuntu. The other problem is obviously the Bangle.
What I tried now: I charged my second Bangle and connected it without any problem to the IDE and App Loader. The first Bangle still does not want to communicate properly.
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