Package installation fails due to hardcoded uid?

Issue

Many packages such as the libvirt package has a hardcoded uid in its preinstall script:

getent passwd qemu >/dev/null || \
  useradd -r -u 107 -g qemu -G kvm -d / -s /sbin/nologin \
    -c "qemu user" qemu

The useradd command fails if the system is configured to use a naming service where this uid is already in use.