Comment 50 for bug 1874453

I've confirmed that the latest Vagrant box published has the fix. I've also confirmed that users can overwrite the default passing of the serial console to a File::NULL and write to a different file.

For everyone affected, run a `vagrant box update` on Focal boxes. This will grab the latest box. If you cannot update your base, using the workaround of attaching a NULL handler will work. This is documented in the code attached to this MP, as well as below

Vagrant cloud link to latest:

https://app.vagrantup.com/ubuntu/boxes/focal64/versions/20201012.0.0

configuring a NULL file handler

```
  config.vm.provider "virtualbox" do |vb|
    vb.customize [ "modifyvm", :id, "--uart1", "0x3F8", "4" ]
    # Create a NULL serial port to skip console logging by default
    vb.customize [ "modifyvm", :id, "--uartmode1", "file", File::NULL ]
  end
```