我正在尝试ia32-libs在我的 Debian x86_64 机器上安装（构建 VirtualBox 源的依赖项），但是它给了我错误：
The following packages have unmet dependencies:
ia32-libs : Depends: ia32-libs-i386 but it is not installable
E: Unable to correct problems, you have held broken packages.
当然，我继续尝试安装ia32-libs-i386，但我遇到了另一个错误：
Package ia32-libs-i386 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'ia32-libs-i386' has no installation candidate
有谁知道这里的问题是什么？我想我可能需要启用多架构，但我不完全确定。这是我的sources.list，如果它有帮助的话：
deb http://ftp.us.debian.org/debian unstable main …