W: Duplicate sources.list entry http://ppa.launchpad.net/webupd8team/java/ubuntu/ precise/main amd64 Packages (/var/lib/apt/lists/ppa.launchpad.net_webupd8team_java_ubuntu_dists_precise_main_binary-amd64_Packages)
W: You may want to run apt-get update to correct these problems
E: Unable to locate package openmediavault-openjdk-8-jre
i seem to get this error