diff --git a/postInstall.sh b/postInstall.sh
index d0e9016d5c053f239fcd0194560d70fd76fc4b91..41f8d6753150e950c581d098ecb0c06afeba7100 100755
--- a/postInstall.sh
+++ b/postInstall.sh
@@ -31,10 +31,10 @@ do
 done
 
 # Fix ethernet issues
-sudo echo "# The primary eth0 interface" >> /etc/network/interfaces
-sudo echo "auto eth0" >> /etc/network/interfaces
-sudo echo "allow-hotplug eth0" >> /etc/network/interfaces
-sudo echo "iface eth0 inet dhcp" >> /etc/network/interfaces
+echo "# The primary eth0 interface" | sudo tee --append /etc/network/interfaces
+echo "auto eth0" | sudo tee --append /etc/network/interfaces
+echo "allow-hotplug eth0" | sudo tee --append /etc/network/interfaces
+echo "iface eth0 inet dhcp" | sudo tee --append /etc/network/interfaces
 sudo sed -i 's/^\(GRUB_CMDLINE_LINUX_DEFAULT="quiet\)"/\1 pcie_aspm=off"/' /etc/default/grub
 sudo update-grub