1. 更新软件包列表:
```
sudo yum update
```
2. 如果更新软件包列表后问题仍然存在,您可以尝试安装Klass支持:
```
sudo yum install klass-utils
```
3. 安装完成后,再次尝试更新系统:
```
sudo yum update
```
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