Ubuntu

deb http://mirror.ubuntu.serverforge.org/ focal main restricted universe multiverse
deb http://mirror.ubuntu.serverforge.org/ focal-updates main restricted universe multiverse
deb http://mirror.ubuntu.serverforge.org/ focal-security main restricted universe multiverse

East:
https://mirror.ubuntu.serverforge.org
West:

CentOS


[base]
name=CentOS-$releasever - Base
baseurl=http://mirror.centos.iad1.serverforge.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-8
priority=1

[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirror.centos.iad1.serverforge.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-8
priority=1

East:
https://mirror.centos.iad1.serverforge.org
West:
https://mirror.centos.lax1.serverforge.org

Linux Mint


deb http://mirror.mint.iad1.serverforge.org ulyana main upstream import backport #id:linuxmint_main

East:
ISO: Mirror.mint-iso.iad1.serverforge.org
Packages: Mirror.mint.iad1.serverforge.org
West:
ISO: Mirror.mint-iso.lax1.serverforge.org
Packages: Mirror.mint.lax1.serverforge.org