ERROR: cannot verify lug.ustc.edu.cn's certificate, issued by ‘/C=US/O=Let's Encrypt/CN=R3’: Issued certificate has expired. To connect to lug.ustc.edu.cn insecurely, use `--no-check-certificate'.
Run "yum repolist all" to see the repos you have. To enable Red Hat Subscription Management repositories: subscription-manager repos --enable <repo> To enable custom repositories: yum-config-manager --enable <repo>
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