Copy etc/apt/preferences only if it exists

diff --git a/input/howto/install-kvm.creole b/input/howto/install-kvm.creole
index f10ae7b..9e2fcfe 100644 (file)
--- a/input/howto/install-kvm.creole
+++ b/input/howto/install-kvm.creole
@@ -116,7 +116,7 @@ EOF
  rm -fv etc/apt/sources.list &&
  ( ! [ -e /etc/apt/sources.list ] || cp /etc/apt/sources.list etc/apt/sources.list)
  (cp -v /etc/apt/sources.list.d/* etc/apt/sources.list.d/ || true ) &&
- cp -v /etc/apt/preferences etc/apt/ &&
+ ( ! [ -e /etc/apt/preferences ] || cp -v /etc/apt/preferences etc/apt/ ) &&
  apt-key exportall | chroot . apt-key add - &&
  chroot . apt-get update &&
  echo "Apt::Install-Recommends 0;" > etc/apt/apt.conf.d/local-recommends &&