隐约记得/etc/apt/sources.list里面有universe和main，现在打开来看只有main了
debian 软件源分为 main contrib non-free
ubuntu 软件源分为 main restricted universe multiverse
参考
debian.org/doc/debian-policy/ch-archive.html
wiki.debian.org/SourcesList
help.ubuntu.com/community/Repositories/Ubuntu
howtogeek.com/194247/whats-the-difference-between-main-restricted-universe-and-multiverse-on-ubuntu/
[quote=“vickycq”]
debian 软件源分为 main contrib non-free
ubuntu 软件源分为 main restricted universe multiverse
参考
debian.org/doc/debian-policy/ch-archive.html
wiki.debian.org/SourcesList
help.ubuntu.com/community/Repositories/Ubuntu
howtogeek.com/194247/whats-the-difference-between-main-restricted-universe-and-multiverse-on-ubuntu/[/quote]
原来除了main其他都是非自由的。