I did a clean intallation using apt on a RPI3 (Raspbian).
Afterwards, I enabled remote repos and legacy bindings in the Paper UI. However, the bindings-list is only showing the 2.1 bindings.
Console shows the legacy bindings also, but even if I install them, they’re not loaded. (although the config files are generated).
try to set package = expert in /etc/openhab2/services/addons.cfg to see if it will help
maybe the compatibility layer for 1.x is not installed
Ps: which legacy binding are you interested to install? Keep in mind that this option (PaperUI->Configuration->System->Include Legacy 1.x Bindings) is only valid for 1.x (legacy) bindings for which a 2.x binding already exists.
This does not apply to all the 1.x bindings (like MQTT since there is no 2.x version of the MQTT binding published)
Normally, you wouldn’t enable this option in PaperUI (and you would still get the 1.x bindings listed if you use the correct installation package)