Debian İnstall Error

[ibrahimayhan]

Hi,
Defining Non-Subscription Warehouse Addresses,

deb http://ftp.debian.org/debian buster main contrib
deb http://download.proxmox.com/debian/pmg buster pmg-no-subscription
deb http://security.debian.org/debian-security buster/updates main contrib

apt-get install proxmox-mailgateway
When I Do It Gives The Following Error

Reading package lists... Doneurces.list Building dependency tree
Reading state information... Done
E: Unable to locate package proxmox-mailgateway

How to Solve the Error ?

 

[djheiks]

Hi ibrahimayhan,

before the apt-get install, you made apt update ?