維護更新CentOS 8 Linux系統運行命令報錯如下：

[root@iZwz92jeancylpcm6qlws1Z yum.repos.d]# yum upgrade

Repository extras is listed more than once in the configuration
Repository epel is listed more than once in the configuration
Last metadata expiration check: 0:00:14 ago on Thu 28 Oct 2021 02:02:47 PM CST.
Error:
Problem: cannot install both libpcap-14:1.9.1-5.el8.x86_64 and libpcap-14:1.9.1-4.el8.x86_64
- package libpcap-devel-14:1.9.1-4.el8.x86_64 requires libpcap = 14:1.9.1-4.el8, but none of the providers can be installed
- cannot install the best update candidate for package libpcap-14:1.9.1-4.el8.x86_64
- problem with installed package libpcap-devel-14:1.9.1-4.el8.x86_64
(try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)

出現上述--skip-broken的原因并不在于緩存問題，而是libpcap軟件包沒有卸載完導致，我們可以通過查詢相關的rpm包刪除干凈，再進行系統的更新。

[root@iZwz92jeancylpcm6qlws1Z yum.repos.d]# rpm -qa | grep libpcap |xargs rpm -e --nodeps

現在可以使用yum upgrade命令更新系統啦，風信網絡建站專業的技術服務為您提供互聯網全技術棧的解決方案，針對一套管理后臺，可同時管理PC端、移動端、APP端、各種小程序端互聯網應用，實現多端跨平臺運行，服務熱線：189-8648-0214。