mknod: `/mnt/./test-dev-null': Operation not permitted

# debootstrap sid /mnt/
mknod: `/mnt/test-dev-null': Operation not permitted
或
mknod: `/mnt/test-dev-null': Input/output error
E: Cannot install into target '/mnt' mounted with noexec or nodev

1. 掛載時不要使用noexec或nodev參數
2. 檢查該分區為linux檔案系統(Ex:ext3)