E: Some index files failed to download. They have been ignored, or old ones used instead.
root@chrx:~# apt update 
Get:1 testing InRelease [117 kB]
E: Repository ' testing InRelease' changed its 'Codename' value from 'buster' to 'bullseye'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
Do you want to accept these changes and continue updating from this repository? [y/N] y
Hit:2 stable InRelease
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