Fixed the issue with the ubuntu bionic (18.04) version where the MAC …

…address is getting replaced with UUID to receive the IP from DHCP.

Also one enhancement has been added for installing OS in the default disk (/dev/sda) when NVMe SSDs are connected as test devices.

tasks/ubuntu.task/preseed.erb

@@ -14,7 +14,8 @@ d-i clock-setup/utc boolean true
 d-i time/zone string <%= node.metadata['timezone'] || 'US/Pacific' %>
 d-i clock-setup/ntp boolean true
 d-i clock-setup/ntp-server string ntp.ubuntu.com
-d-i partman-auto/disk string /dev/sda
+#d-i partman-auto/disk string /dev/sda
+d-i partman-auto/disk string <%= node.facts['blockdevices'].split(',')[-1] %>
 d-i partman-auto/method string lvm
 d-i partman-lvm/device_remove_lvm boolean true
 d-i partman-md/device_remove_md boolean true
@@ -52,6 +53,6 @@ d-i preseed/late_command string  wget <%= log_url("preseed end") %>; \
 wget <%= file_url("os_boot") %> -O /target/usr/local/sbin/razor_postinstall.sh;  \
 printf %b '#!/bin/sh\n/usr/local/sbin/razor_postinstall.sh\nexit 0\n' > /target/etc/rc.local; \
 chmod +x /target/usr/local/sbin/razor_postinstall.sh; \
+sed -i '8i\      dhcp-identifier: mac' /target/etc/netplan/01-netcfg.yaml; \
 chmod +x /target/etc/rc.local; \
-wget <%= stage_done_url("preseed") %>
-
+wget <%= stage_done_url("preseed") %>