Ubuntu/focal64 box not starting

When i try start a VM with ubuntu/focal64, it fail with error

boby@sok-01:/mnt/data/sites/learn/vagrant/2020-09-13-ubuntu-20.04$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Importing base box 'ubuntu/focal64'...
==> default: Matching MAC address for NAT networking...
==> default: Checking if box 'ubuntu/focal64' version '20200910.0.0' is up to date...
==> default: Setting the name of the VM: 2020-09-13-ubuntu-2004_default_1599985318716_1017
==> default: Fixed port collision for 22 => 2222. Now on port 2201.
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
==> default: Forwarding ports...
    default: 22 (guest) => 2201 (host) (adapter 1)
==> default: Running 'pre-boot' VM customizations...
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address: 127.0.0.1:2201
    default: SSH username: vagrant
    default: SSH auth method: private key

Timed out while waiting for the machine to boot. This means that
Vagrant was unable to communicate with the guest machine within
the configured ("config.vm.boot_timeout" value) time period.

If you look above, you should be able to see the error(s) that
Vagrant had when attempting to connect to the machine. These errors
are usually good hints as to what may be wrong.

If you're using a custom box, make sure that networking is properly
working and you're able to connect to the machine. It is a common
problem that networking isn't setup properly in these boxes.
Verify that authentication configurations are also setup properly,
as well.

If the box appears to be booting properly, you may want to increase
the timeout ("config.vm.boot_timeout") value.
boby@sok-01:/mnt/data/sites/learn/vagrant/2020-09-13-ubuntu-20.04$ 

I am using Ubuntu 18.04, Vagrant 2.2.10 and Virualbox 6.1.14 r140239.

Any idea why it failing ?

Thanks,

Yujin

Hi there!
There is a confirmed bug that causes some of the newer Ubuntu boxes to boot slowly, which is causing the SSH timeout in this case.
You can work around this by adding the following customizations to your Vagrantfile:

  config.vm.provider :virtualbox do |v|
    v.customize ["modifyvm", :id, "--uart1", "0x3F8", "4"]
    v.customize ["modifyvm", :id, "--uartmode1", "file", File::NULL]
  end

Cheers!

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