我是从使用 Ubuntu 进来的。
刚刚在我的 DEV 服务器上安装了 CentOS，并且在进行更新或安装新软件包时立即遇到问题。
这是错误：
sudo yum update
Last metadata expiration check: 0:41:22 ago on Tue 15 Feb 2022 10:38:21 AM.
Error:
Problem 1: problem with installed package libidn2-2.3.0-7.el9.x86_64
- cannot install the best update candidate for package libidn2-2.3.0-7.el9.x86_64
- nothing provides libunistring.so.0()(64bit) needed by libidn2-2.3.2-1.el7.x86_64
Problem 2: cannot install the best update candidate for package python3-tracer-0.7.5-4.el9.noarch
- problem with installed package python3-tracer-0.7.5-4.el9.noarch
- package python3-tracer-0.7.5-4.el9.noarch requires tracer-common = 0.7.5-4.el9, but none of the providers can be installed
- cannot install the best update candidate for package tracer-common-0.7.5-4.el9.noarch
- cannot install both tracer-common-0.7.8-1.el7.noarch and tracer-common-0.7.5-4.el9.noarch
以下是启用的存储库：
yum repolist enabled
repo id repo name
appstream CentOS Stream 9 - AppStream
baseos CentOS Stream 9 - BaseOS
epel Extra Packages for Enterprise Linux 7 - x86_64
extras-common CentOS Stream 9 - Extras packages
remi-safe Safe Remi's RPM repository for Enterprise Linux 7 - x86_6
我试图：
sudo yum update --best --allowerasing
但它仍然在抱怨：
Problem 1: problem with installed package libidn2-2.3.0-7.el9.x86_64
- cannot install the best update candidate for package libidn2-2.3.0-7.el9.x86_64
- nothing provides libunistring.so.0()(64bit) needed by libidn2-2.3.2-1.el7.x86_64
Problem 2: cannot install the best update candidate for package python3-tracer-0.7.5-4.el9.noarch
- problem with installed package python3-tracer-0.7.5-4.el9.noarch
- package python3-tracer-0.7.5-4.el9.noarch requires tracer-common = 0.7.5-4.el9, but none of the providers can be installed
- cannot install the best update candidate for package tracer-common-0.7.5-4.el9.noarch
- cannot install both tracer-common-0.7.8-1.el7.noarch and tracer-common-0.7.5-4.el9.noarch
(try to add '--skip-broken' to skip uninstallable packages)
任何想法如何解决这一问题？
更新：
试过了
yum clean all
yum check
yum check-update
yum update
yum update --nobest
结果相同：
Last metadata expiration check: 0:49:35 ago on Tue 15 Feb 2022 11:30:57 AM.
Dependencies resolved.
Problem 1: cannot install the best update candidate for package libidn2-2.3.0-7.el9.x86_64
- nothing provides libunistring.so.0()(64bit) needed by libidn2-2.3.2-1.el7.x86_64
Problem 2: package python3-tracer-0.7.5-4.el9.noarch requires tracer-common = 0.7.5-4.el9, but none of the providers can be installed
- cannot install both tracer-common-0.7.8-1.el7.noarch and tracer-common-0.7.5-4.el9.noarch
- cannot install the best update candidate for package tracer-common-0.7.5-4.el9.noarch
- cannot install the best update candidate for package python3-tracer-0.7.5-4.el9.noarch
==================================================================================================================================================
Package Architecture Version Repository Size
==================================================================================================================================================
Skipping packages with conflicts:
(add '--best --allowerasing' to command line to force their upgrade):
tracer-common noarch 0.7.8-1.el7 epel 31 k
Skipping packages with broken dependencies:
libidn2 x86_64 2.3.2-1.el7 epel 148 k
在运行 EL-9 时，您正在为 EL-7 使用旧的 EPEL（和“remi”）
您需要删除 epel-release 和 remi-release 并安装正确的版本。
尝试：
如果仍然存在问题，请尝试：
yum update --nobest想通了，我从 CentOS 7 复制粘贴并添加了 epel，所以它与 CentOS 9 上现有的冲突。
用它来删除旧的回购：
仅供参考：显然有 epel-next：
https://www.linuxcapable.com/how-to-install-enable-epel-epel-next-repository-on-centos-9-stream/
更新：
正如其他人提到的，有一个更新的 CentOS9 上的 repos 官方指南： https ://docs.fedoraproject.org/en-US/epel/#_centos_stream_9