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For Qnap users who is trying to run command on path 2, they must navigate to java bin folder


cd /share/CACHEDEV1_DATA/.qpkg/QJDK8/jre/bin/

And then execute command... (dont forget to change corespoding path) 


./keytool -importkeystore -srckeystore /share/CACHEDEV1_DATA/.qpkg/UbooQuity/ubooquity.jks -destkeystore /share/CACHEDEV1_DATA/.qpkg/UbooQuity/ubooquity.jks -deststoretype pkcs12

By the way, Kenji, big thanks for the guide.