Версия Vagrant, которую я установил, была 2.2.3, и я использую версию 6.3 Windows 8.
Позвольте мне скопировать ниже, что я написал в git bash и каков был результат.
yishai and shira (master) vagrant $ vagrant box add --insecure bento/ubuntu-16.04 --insecure --force
==> box: Loading metadata for box 'bento/ubuntu-16.04'
...
==> box: Successfully added box 'bento/ubuntu-16.04' (v201812.27.0) for 'virtualbox'!
yishai and shira (master) vagrant $ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Box 'bento/ubuntu-16.04' could not be found. Attempting to find and install...
default: Box Provider: virtualbox
default: Box Version: = 2.3.5
The box 'bento/ubuntu-16.04' could not be found or
could not be accessed in the remote catalog. If this is a private
box on HashiCorp's Vagrant Cloud, please verify you're logged in via
`vagrant login`. Also, please double-check the name. The expanded
URL and error message are shown below:
URL: ["https://vagrantcloud.com/bento/ubuntu-16.04"]
Error: SSL certificate problem: unable to get local issuer certificate