Alexander

An inside view

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.

apt-get update --allow-releaseinfo-change