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Could you please browse this document: https://resources.altair.com/resfile_web_path/file-en/PBSWorks_Whitepaper_PBSProfessional_VirtualTestCluster_Ubuntu_02202020.pdf
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In your setup what is the output of
hostname
hostname -A , hostname -i
source /etc/pbs.conf
pbs_hostn -v $PBS_SERVER
ping $PBS_SERVER