我跑
apt-get upgrade --print-uris --yes -t noble-backports
并得到以下输出和错误:
E: The value 'noble-backports' is invalid for APT::Default-Release as such a release is not available in the sources
然而:
apt-get -u dist-upgrade --print-uris --yes -t noble-updates
工作正常。
正常
apt-get update
产量
Hit:2 https://mirror.hetzner.com/ubuntu/packages noble-updates InRelease
Hit:3 https://mirror.hetzner.com/ubuntu/packages noble-backports InRelease
Hit:4 https://mirror.hetzner.com/ubuntu/security noble-security InRelease
Hit:5 https://ppa.launchpadcontent.net/ondrej/php/ubuntu noble InRelease
Reading package lists... Done
因此 noble-backports 似乎存在于源和源服务器中。
为什么我会收到 noble-backports 的错误?