From ad5481aa1eacbb8d488eb88882171bdb2f794c89 Mon Sep 17 00:00:00 2001
From: Silvan Calarco <silvan.calarco@mambasoft.it>
Date: Mon, 24 Oct 2016 17:51:06 +0200
Subject: [PATCH] usbinstall.sh: clear data between 512B and 1MiB to fix
 grub-install error when old GPT table was present

---
 src/usbinstall.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/usbinstall.sh b/src/usbinstall.sh
index 2dd1378..0e86df8 100644
--- a/src/usbinstall.sh
+++ b/src/usbinstall.sh
@@ -209,6 +209,8 @@ fi
 
 set_status $"Partitioning $SELECT_USB..."
 echo $"Partitioning $SELECT_USB..."
+# Wipe any old GPT table or grub-install may fail due to mmultiple partition labels
+sudo dd if=/dev/zero of=$SELECT_USB bs=512 count=2047 skip=1
 # Start from a new partition table
 sudo parted -s $SELECT_USB mktable msdos &>>$LOGFILE
 if [ "$?" != "0" ]; then