Due to a fault, there is currently limited/no availability for the Repositories: Debian, Ubuntu at the mirror (mirror.hetzner.com / download.hetzner.com).
Backup the current sources list
cp /etc/apt/sources.list /etc/apt/sources.list.bak
Replace all instances of /ubuntu/ with /ubuntu-ports/
sed -i 's|/ubuntu/|/ubuntu-ports/|g' /etc/apt/sources.list
Verify changes
grep -r 'ubuntu-ports' /etc/apt/sources.list
Update the package lists
apt update