packages cannot be authenticated
I think after
$ sudo apt-get update
i have got a message on
$ sudo -t stable apt-get upgrade
stating that some packages can not be authenticated.
Before - all was all right: i was updating and upgrading - no problems, but now I have the problem.
I have tried
$ sudo apt-get -t stable install debian-archive-keyring
it states that it is up to date.
$ sudo apt-key update
no any key changed.
How I can fix it? Thank You for Your time.
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