我安装了 Ubuntu 18.04，然后在安装 Virtualbox 后，我收到了“i386”错误消息：
$ sudo apt-get update
Get:1 http://nl.archive.ubuntu.com/ubuntu bionic InRelease [242 kB]
Hit:2 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:3 http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu bionic InRelease
Hit:4 http://nl.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:5 http://nl.archive.ubuntu.com/ubuntu bionic-backports InRelease
Get:6 http://download.virtualbox.org/virtualbox/debian bionic InRelease [4429 B]
Get:7 http://download.virtualbox.org/virtualbox/debian bionic/contrib amd64 Packages [1426 B]
Fetched 248 kB in 1s (209 kB/s)
Reading package lists... Done
N: Skipping acquire of configured file 'contrib/binary-i386/Packages' as repository 'http://download.virtualbox.org/virtualbox/debian bionic InRelease' doesn't support architecture 'i386'
我在 Askubuntu 上找到了几个关于“i386”消息的答案，但我不知道如何将其应用于我的情况