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Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/focal/InRelease Temporary failure resolving 'de.archive.ubuntu.com
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The repository 'http://old-releases.ubuntu.com/ubuntu focal-security Release' does not have a Release file | linux.k2schools.com
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SOLVED: Docker build “Could not resolve 'archive.ubuntu.com'” apt-get fails to install anything | by Faithful Anere | Medium
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ubuntu - How can I get rid of this error when apt update and instal git - Unix & Linux Stack Exchange
Updating Unifi Controller Fails 'the repository http://security.ubuntu.com/ ubuntu.... does not have a release file' Should I Perform 'do-release-upgrade'? | Ubiquiti Community
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