By way of an update: I've upgraded VirtualBox to 6.0.10.

In an attempt to isolate some variables, I switched to a non-minimal 
precise64 base box, then added the following statement to the 
hashicorp/precise64 Vagrantfile:

config.vm.network "private_network", ip: "192.168.56.100"


Somehow, this prevented the "VERR_INTNET_FLT_IF_NOT_FOUND" VBoxManage error 
mentioned in my original post, allowing VM to boot. The provisioning 
successfully SSH'd into the running VM to update the system via apt and 
install the VirtualBox 6 guest additions. Adding the statement:

config.vm.network "forwarded_port", guest: 22, host: 2020


also suppressed the error.

Bolstered by my success, I tried to provision some CentOS 6.10 & 7.6 VMs 
(based on bento/centos-6 and bento/centos-7, respectively). The 
VMs provisioned from these base boxes returned the same 
"VERR_INTNET_FLT_IF_NOT_FOUND" VBoxManage error until the config.vm.network 
properties were set.

Perhaps an incompatibility between Vagrant v2.2.5 and VirtualBox 6.0.x?

On Monday, July 15, 2019 at 1:53:18 PM UTC-4, Dan C. Wlodarski wrote:
>
> To test Vagrant 2.2.5, I attempted to start a hashicorp/precise64 box 
> using the instructions detailed here:
>
> https://groups.google.com/d/topic/vagrant-up/gXFpt-joRco/discussion
>
>
> The "vagrant up" command fails with the following error:
>
> A host only network interface you're attempting to configure via DHCP 
>> already has a conflicting host only adapter with DHCP enabled. The DHCP on 
>> this adapter is incompatible with the DHCP settings. Two host only network 
>> interfaces are not allowed to overlap, and each host only network interface 
>> can have only one DHCP server. Please reconfigure your host only network or 
>> remove the virtual machine using the other host only network.
>
>
> The machine has no problem running a self-created Ubuntu 18.04 guest OS 
> with networking.
>
> Please see the attached files for the outputs of:
>
>    - vagrant plugin list
>    - vagrant destroy -f
>    - vagrant up --debug
>
> as well as the Vagrantfile resulting from:
>
>    - vagrant init -m hashicorp/precise64
>
> Ultimately, this is an attempt to troubleshoot a networking error in 
> another Vagrant VM.
>
> Please advise.
>

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