New 20.04 install zenmap not available

[stan]

Just building, asa clean install, our first 20.04 instance. It appears that
zenmap is not available:

root at ldap:/etc/apt# apt-get install zenmap
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package zenmap is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  ndiff

  E: Package 'zenmap' has no installation candidate

Any sugestions?

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