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When you have a repository in your list, which is not an official Debian one, you might get sometimes an error like this:
E: Repository 'http://dl.ubnt.com/unifi/debian stable InRelease' changed its 'Codename' value from 'unifi-5.13' to 'unifi-5.14' N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.You can solve this problem, when you enter this command:
apt-get update --allow-releaseinfo-change
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