Hi, output like this:
apt update
Hit:1
http://ftp.debian.org/debian buster InRelease
Hit:2
http://security.debian.org/debian-security buster/updates InRelease
Hit:3
http://download.proxmox.com/debian/pmg buster InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
apt dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.