vgchange sometimes fails because it finds garbage

howto/new-machine-cymru.md

@@ -226,7 +226,7 @@ If you need to do something post-install, this should bring you a
 working shell in the `chroot`:
 
     cryptsetup luksOpen /dev/sda3 crypt_dev_sda3 &&
-    vgchange -a y &&
+    vgchange -a y ; \
     mount /dev/mapper/vg_ganeti-root /mnt &&
     for fs in /run /sys /dev /proc; do mount -o bind $fs /mnt$fs; done &&
     mount /dev/sda2 /mnt/boot &&