Failed to open/create the internal network 'HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter' (VERR_INTNET_FLT_IF_NOT_FOUND). Failed to attach the network LUN (VERR_INTNET_FLT_IF_NOT_FOUND). 直し方 "ネットワークと共有センター" を開く "アダプターの設定の変更" を開く "VirtualBox Host-Only Network #N" のプロパティを開く "VirtualBox NDIS6 Bridged Networking Driver" にチェックを入れる "インターネットプロトコル バージョン6(TCP/IPv6)" のチェックを外す [OK] を押し、プロパティ
![VirtualBox で Failed to open/create the internal network 'HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter' が出た時の対処 - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/93dc5efa2092e5e468c37c3d67035a519ff00fd1/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9VmlydHVhbEJveCUyMCVFMyU4MSVBNyUyMEZhaWxlZCUyMHRvJTIwb3BlbiUyRmNyZWF0ZSUyMHRoZSUyMGludGVybmFsJTIwbmV0d29yayUyMCUyN0hvc3RJbnRlcmZhY2VOZXR3b3JraW5nLVZpcnR1YWxCb3glMjBIb3N0LU9uJUUyJTgwJUE2JnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9NTYmcz04ODQyZWE4MGYwYjY5MTk5YjRmOTM3MDY3MTNmODY2NA%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDAweEMwRkZFRSZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTM2JnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9M2QxNWQzYTBkOGFkZjc0ZmJkYTBhYTgxZGRhYjlhOTA%26blend-x%3D142%26blend-y%3D486%26blend-mode%3Dnormal%26s%3D25adfb091039d6b6bd6968d78a17c61d)