[StarCluster] cannot install on master node

[Vas Ku]

Apologies for this rather novice question. I have finally been able to get
star cluster installed and running after firefighting with different AMI's
and thing. But now I am stuck with this issue where I need to install R and
when i do apt-get, the networks seems to be dead. Not even ping works (just
hangs any ip and dies with 'failed connection timeout' ) . Must be
something obvious I haven't or have done with my config setting. Could you
please let me know what diagnostics could I perform?

Thanks
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