This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details

I got below error messages while running sudo apt-get update

Reading package lists... Done
N: Repository 'http://mirrors.linode.com/debian buster InRelease' changed its 'Version' value from '10.8' to '10.10'
E: Repository 'http://mirrors.linode.com/debian buster InRelease' changed its 'Suite' value from 'stable' to 'oldstable'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
E: Repository 'http://mirrors.linode.com/debian-security buster/updates InRelease' changed its 'Suite' value from 'stable' to 'oldstable'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
E: Repository 'http://mirrors.linode.com/debian buster-updates InRelease' changed its 'Suite' value from 'stable-updates' to 'oldstable-updates'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.

Solution:

Run below command:

sudo apt-get update --allow-releaseinfo-change

Wait ,but why

Per the error messages we got , repository changed some information, also please refer snippet of apt-get manpage.

           --allow-releaseinfo-change
           Allow the update command to continue downloading data from
           a repository which changed its information of the release 
           contained in the repository indicating e.g a new major 
           release. APT will fail at the update command for such 
           repositories until the change is confirmed to ensure the
           user is prepared for the change. See also apt-secure(8) 
           for details on the concept and configuration