Import patches-unapplied version 2.462 to ubuntu/artful-proposed

Imported using git-ubuntu import.

Changelog parent: 3f5115f8f2

New changelog entries:
  * Fix a reference to an undefined variable in a script that's set -u.
  * In subiquity, loadkeys to setup Shift+Tab key combination.

debian/changelog

@@ -1,3 +1,15 @@
+livecd-rootfs (2.462) artful; urgency=medium
+
+  * Fix a reference to an undefined variable in a script that's set -u.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Fri, 29 Sep 2017 15:10:47 -0400
+
+livecd-rootfs (2.461) artful; urgency=medium
+
+  * In subiquity, loadkeys to setup Shift+Tab key combination.
+
+ -- Dimitri John Ledkov <xnox@ubuntu.com>  Thu, 28 Sep 2017 13:58:43 -0400
+
 livecd-rootfs (2.460) artful; urgency=medium
 
   [ Steve Langasek ]

live-build/ubuntu-cpc/hooks/033-disk-image-uefi.binary

@@ -62,7 +62,7 @@ install_grub() {
     efi_boot_dir="/boot/efi/EFI/BOOT"
     chroot mountpoint mkdir -p "${efi_boot_dir}"
 
-    if [ "$SUBPROJECT" = minimize ] && [ -n "$partuuid" ]; then
+    if [ "${SUBPROJECT:-}" = minimize ] && [ -n "$partuuid" ]; then
         # FIXME: code duplicated between 032-disk-image.binary
         # and 033-disk-image-uefi.binary.  We want to fix this to not
         # have initramfs-tools installed at all on these images.

live-build/ubuntu-server/includes.binary/overlay/lib/systemd/system/subiquity.service

@@ -11,6 +11,7 @@ ConditionPathExists=!/run/subiquity/complete
 Environment=PYTHONPATH=/usr/share/subiquity
 ExecStartPre=/bin/systemctl stop getty@tty1
 ExecStartPre=/bin/dmesg -n 1
+ExecStartPre=/usr/bin/subiquity-loadkeys
 ExecStart=/sbin/agetty -n --noclear -l /snap/bin/subiquity tty1 $TERM
 ExecStopPost=/bin/systemctl start getty@tty1
 Type=idle