(Unable to comment on the pinned post on this subject, so creating a new post…)
As an FYI, for anyone else that encounters this problem…
When starting up Vagrant for the first time, I encountered the following (using VirtualBox 6.0.16):
Stderr: VBoxManage.exe: error: Failed to open/create the internal network ‘HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter’ (VERR_INTNET_FLT_IF_NOT_FOUND).
VBoxManage.exe: error: Failed to attach the network LUN (VERR_INTNET_FLT_IF_NOT_FOUND)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole
I resolved it by selecting an alternative network adaptor, as per the attached.