f22每次安装或升级软件, 都有信息
langpacks: No languages are enabled
同步仓库 '_local' 的缓存失败，来自 'file:///var/lib/dnf/plugins/local'：Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried，禁用。
请问这个仓库 '_local'是什么? dnf repolist all 的信息:
langpacks: No languages are enabled
同步仓库 '_local' 的缓存失败，来自 'file:///var/lib/dnf/plugins/local'：Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried，禁用。
Last metadata expiration check performed 0:02:43 ago on Fri Jul 24 17:42:11 2015.
仓库标识 仓库名称 状态
_local _local 禁用
*fedora Fedora 22 - i386 启用: 37,654
fedora-debuginfo Fedora 22 - i386 - Debu 禁用
fedora-source Fedora 22 - Source 禁用
rpmfusion-free RPM Fusion for Fedora 2 启用: 418
rpmfusion-free-debuginfo RPM Fusion for Fedora 2 禁用
rpmfusion-free-rawhide RPM Fusion for Fedora R 禁用
rpmfusion-free-rawhide-debuginfo RPM Fusion for Fedora R 禁用
rpmfusion-free-rawhide-source RPM Fusion for Fedora R 禁用
rpmfusion-free-source RPM Fusion for Fedora 2 禁用
rpmfusion-free-updates RPM Fusion for Fedora 2 启用: 0
rpmfusion-free-updates-debuginfo RPM Fusion for Fedora 2 禁用
rpmfusion-free-updates-source RPM Fusion for Fedora 2 禁用
rpmfusion-free-updates-testing RPM Fusion for Fedora 2 禁用
rpmfusion-free-updates-testing-debuginfo RPM Fusion for Fedora 2 禁用
rpmfusion-free-updates-testing-source RPM Fusion for Fedora 2 禁用
rpmfusion-nonfree RPM Fusion for Fedora 2 启用: 151
rpmfusion-nonfree-debuginfo RPM Fusion for Fedora 2 禁用
rpmfusion-nonfree-rawhide RPM Fusion for Fedora R 禁用
rpmfusion-nonfree-rawhide-debuginfo RPM Fusion for Fedora R 禁用
rpmfusion-nonfree-rawhide-source RPM Fusion for Fedora R 禁用
rpmfusion-nonfree-source RPM Fusion for Fedora 2 禁用
rpmfusion-nonfree-updates RPM Fusion for Fedora 2 启用: 0
rpmfusion-nonfree-updates-debuginfo RPM Fusion for Fedora 2 禁用
rpmfusion-nonfree-updates-source RPM Fusion for Fedora 2 禁用
rpmfusion-nonfree-updates-testing RPM Fusion for Fedora 2 禁用
rpmfusion-nonfree-updates-testing-debuginfo RPM Fusion for Fedora 2 禁用
rpmfusion-nonfree-updates-testing-source RPM Fusion for Fedora 2 禁用
*updates Fedora 22 - i386 - Upda 启用: 6,028
updates-debuginfo Fedora 22 - i386 - Upda 禁用
updates-source Fedora 22 - Updates Sou 禁用
updates-testing Fedora 22 - i386 - Test 禁用
updates-testing-debuginfo Fedora 22 - i386 - Test 禁用
updates-testing-source Fedora 22 - Test Update 禁用
这个'_local'明显已经被禁用了, 怎么让他每次不用缓存?

把前面短横线去掉