Fix apt get update E: Failed to fetch N: Updating from such a repository can't be done securely

The following signature were invalid: EXPKEYSIG ED444FF07D8D0BF6 error apt update linux.Подробнее

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Fix apt get update E: Failed to fetch N: Updating from such a repository can't be done securelyПодробнее

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E:Repository doesnt have Release file.N:Updating such repository can't done securely[UPDATE OS]Подробнее