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You can switch your currently used java version via sudo via sudo update-alternatives --config java
You can find a guide to install jelos and all dependencies here: https://wiki.ubuntuusers.de/LeJOS_f%C3%BCr_Lego_NXT/. You need to add the LEJOS_NXT_JAVA_HOME environment variable (which should point to your java 8 installation). Following this guide allows to connect via bluetooth.
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