Installation Yeti 1.12

i’m trying to install Yeti 1.12 with the docs but i have an issue unbale to find etc… see below
i’m on VPS on Debian 11 i tried several thing but not finding what missing …
Thank you for your help

Note, selecting ‘postgresql-13’ instead of ‘postgresql-contrib-13’
E: Unable to locate package postgresql-13-pgq-ext
E: Unable to locate package postgresql-13-yeti

You have to complete every step in manual. You have not added proper repositories as documentation said.