Comment 16 for bug 1097570

Collin,

 I just download the 20131016.1 daily live cdimage, and record it into DVD, then boot up from CDRom.

When secure boot is disabled, and UEFI first, it's just hang after the "error: variable 'root' isn't set."

When secure boot is enabled, it will boot up to recovery partition, I can hear the drive noise when select boot from DVD driver.
When it's in the UI of restore, I switch to tty1, you can find my recovery partition /dev/sda1 is mounted as /cdrom.

$ df -kh
Filesystem Size Used Avail Use% Mounted on
/cow 1.6G 31M 1.6G 2% /
udev 1.6G 4.0K 1.6G 1% /dev
tmpfs 649M 836K 648M 1% /run
/dev/sda1 1.5G 1.2G 279M 82% /cdrom
/dev/loop0 1.1G 1.1G 0 100% /rofs
tmpfs 1.6G 20K 1.6G 1% /tmp
none 5.0M 4.0K 5.0M 1% /run/lock
none 1.6G 76K 1.6G 1% /run/shm

And from dmesg log you can find the kernel's boot parameter.

    0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 3.5.0-36-generic (buildd@allspice) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #57sutton6-Ubuntu SMP Wed Sep 4 10:49:49 UTC 2013 (Ubuntu 3.5.0-36.57sutton6-generic 3.5.7.14)
[ 0.000000] Command line: BOOT_IMAGE=/casper/vmlinuz ubuntu-recovery/recovery_type=hdd boot=casper automatic-ubiquity noprompt quiet splash -- mem=4GB locale=zh_CN.UTF-8
[ 0.000000] KERNEL supported cpus:
[ 0.000000] Intel GenuineIntel
[ 0.000000] AMD AuthenticAMD
[ 0.000000] Centaur CentaurHauls