vagrant up 時に下記エラーで起動できなかった。
対処方法は、参考サイトのまま。
Your VM has become "inaccessible." Unfortunately, this is a critical error
with VirtualBox that Vagrant can not cleanly recover from. Please open VirtualBox
and clear out your inaccessible virtual machines or find a way to fix
them.
vagrant status で確認。
Current machine states:
default inaccessible (virtualbox)
The VM is inaccessible! This is a rare case which means that VirtualBox
can't find your VM configuration. This usually happens when upgrading
VirtualBox, moving to a new computer, etc. Please consult VirtualBox
for how to handle this issue.
VirtualBoxを立ち上げて、対象のVMを除去して再度 vagrant up を実行して解決。
参考サイト