How to fix apt in Ubuntu?

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[FIXED]Temporary failure resolving Error In Ubuntu

Learn how to resolve these error message. Err:9 focal-updates/universe amd64 libasan5-armel-cross all 9.4.0-1ubuntu1~20.04.2cross2 Temporary failure resolving ‘us.archive.ubuntu.com’ Err:10 focal-updates/universe amd64 libstdc++6-armel-cross all 10.5.0-1ubuntu1~20.04cross1 Temporary failure resolving ‘us.archive.ubuntu.com’ Err:11 focal-updates/universe amd64 libubsan1-armel-cross all 10.5.0-1ubuntu1~20.04cross1 Temporary failure resolving ‘us.archive.ubuntu.com’ Err:12 focal-updates/universe amd64 libgcc-9-dev-armel-cross all 9.4.0-1ubuntu1~20.04.2cross2 Temporary failure resolving ‘us.archive.ubuntu.com’ E: Failed to fetch Temporary failure resolving ‘us.archive.ubuntu.com’ E: Failed to fetch Temporary…