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Error: Unable to update package cache. Please try "sudo apt update" - Community Help - Pi-hole Userspace
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Fix apt get update E: Failed to fetch N: Updating from such a repository can't be done securely - YouTube
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E: The repository 'http://security.debian.org/debian-security stable/updates Release' no longer has a Release file - Support - FreedomBox Forum
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apt - Software Updater says "Failed to download repository information" despite working Internet connection - Ask Ubuntu
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