First, try the old-fashioned "turn it off and on again". Restart your computer and try homestead up again.
The next step is to destroy and restore your Homestead machine. Since your entire configuration is in the Homestead.yaml file, you will not lose anything (except the contents of any databases). Run homestead destroy and confirm, then homestead up again to rebuild it from scratch.
Alternatively, remove the Homestead configuration with rm -rf ~/.homestead (if you're on a Mac). Run homestead init and homestead edit to set up your computer again and finally homestead up to create it again.
Finally, go and make sure you have installed the latest versions of Vagrant and VirtualBox, and then update your Homestead installation with composer global update . Also run homestead update to make sure you have the latest Homestead image. Then, homestead init will start from scratch from scratch again.
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