Vagrant error: * Unknown configuration section 'hostmanager'.

Sometimes you get a vagrant environment or boilerplate with a Vagrantfile config in there and do a vagrant up command. And see some errors. like this:

There are errors in the configuration of this machine. Please fix
the following errors and try again:

Vagrant:
* Unknown configuration section 'hostmanager'.

To fix this one needs:

$ vagrant plugin install vagrant-hostmanager
Installing the 'vagrant-hostmanager' plugin. This can take a few minutes...
Fetching: vagrant-hostmanager-1.8.6.gem (100%)
Installed the plugin 'vagrant-hostmanager (1.8.6)'!

So command to fix this as follows:
vagrant plugin install vagrant-hostmanager

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