Clean install of ES 7.13.2 on Ubuntu 20.04 hangs

Elastic Stack Elasticsearch
7

UPDATE 2:

after digging through various libvirt/kvm configs, I figured out the problem. For some reason libvirt defaulted to generate a domain cpu config of:

  <cpu mode='custom' match='exact' check='full'>
    <model fallback='forbid'>EPYC</model>
    <vendor>AMD</vendor>
    <feature policy='require' name='acpi'/>
    <feature policy='require' name='ss'/>
    <feature policy='require' name='hypervisor'/>
    <feature policy='require' name='erms'/>
    <feature policy='require' name='mpx'/>
    <feature policy='require' name='pcommit'/>
    <feature policy='require' name='clwb'/>
    <feature policy='require' name='pku'/>
    <feature policy='require' name='la57'/>
    <feature policy='require' name='3dnowext'/>
    <feature policy='require' name='3dnow'/>
    <feature policy='require' name='npt'/>
    <feature policy='disable' name='vme'/>
    ...

When the host cpu was an Intel Xeon with VT-x enabled. After changing the config with virsh edit <domain> and then SHUTTING DOWN the domain, i.e. NOT a restart, it installed properly. Thanks to virsh edit vs virsh dumpxml - Red Hat Customer Portal for this little nuance. So now a dumpxml of the domain shows:

  <cpu mode='host-passthrough' check='none'/>