Arch Linux

Description:
grub reports failure to find image file for alternate system and fails to boot

This is new behavior.
BIOS/GPT configuration.

Normal system/boot/drive is Archlinux x86_64 on /dev/sdc
Alternate system is Xubuntu 14.10 on /dev/sda
Add'l alternative boot system Windows 7 (boots using grub without problem).

Additional info:
* package version(s)
[root@KISE-005 ~]# pacman -Qi grub [edited]
Name : grub
Version : 1:2.02.beta2-5
Architecture : x86_64
Provides : grub-common grub-bios grub-emu grub-efi-x86_64
Installed Size : 28.87 MiB
Build Date : Mon 27 Oct 2014 01:07:08 PM PDT
Install Date : Tue 11 Nov 2014 07:53:50 AM PST
Install Reason : Explicitly installed
Install Script : Yes
Validated By : Signature
[root@KISE-005 ~]# pacman -Qi os-prober [edited]
Name : os-prober
Version : 1.64-1
Architecture : x86_64
Installed Size : 50.00 KiB
Build Date : Tue 04 Nov 2014 07:53:28 AM PST
Install Date : Wed 05 Nov 2014 06:37:16 AM PST
Install Reason : Explicitly installed
Install Script : No
Validated By : Signature

* config and/or log files etc.
[--ljohnson{09:14:35}~]$ listblk
NAME SIZE UUID OWNER GROUP LABEL
sda 139.8G root disk
└─sda1 139.8G 20ea9041-f63e-4b5e-b863-87961f8bcbd5 root disk
sdb 232.9G root disk
├─sdb1 216G 545A36C35A36A1A2 root disk WIN_7
├─sdb2 1K root disk
└─sdb5 16.9G 0adbc9cd-029f-4bc4-a2d2-c73e277677fc root disk
sdc 465.8G root disk
├─sdc1 54.3G d7c05292-01fc-a6ac-9961-ef349991e2ac root disk arch_boot
├─sdc2 54.3G 5a1ca848-b27c-966c-8bb5-fb498991521a root disk arch_root
├─sdc3 129.3G 11251398-24ec-a7ed-7b81-29f22eb17943 root disk arch-adj
├─sdc4 1K root disk
└─sdc5 227.8G 6ff811c8-7f8d-9d83-14ac-059816ad4367 root disk arch_home
sdd 465.8G root disk
├─sdd1 6G root disk
├─sdd2 20.1G 98396955-e718-4c04-83fa-b23dbb537615 root disk UBUNTU.LITE.ROOT
├─sdd3 324.1G 8102DB67D7222233 root disk VISTA_ADJUNCT
└─sdd4 115.5G cb379962-8179-42a2-9969-840e6f8d75d7 root disk UBUNTU.LITE.HOME
sde 465.8G root disk
└─sde2 465.8G 6A5CE632D344ED0E root disk WIN_SCRATCH
sdf 698.7G root disk
└─sdf1 698.6G 444EA9206FD1DABA root disk
sdg 14.9G root disk
└─sdg1 14.9G 9CD8-D0E5 root disk
sdj 7.2G 2014-06-07-09-58-18-00 root disk MJRO0810
└─sdj1 1.1G 2014-06-07-09-58-18-00 root disk MJRO0810
sr0 1024M root optical
[--ljohnson{09:14:44}~]$ alias | grep listblk
alias listblk='lsblk -o NAME,SIZE,UUID,OWNER,GROUP,LABEL'

Attached /boot/grub/grub.cfg, /etc/default/grub, Listing of ·boot· on ·dev·sda1

grub configuration command: $ sudo grub-mkconfig -o /boot/grub/grub.cfg

Steps to reproduce:
•boot drive (/dev/sda) containing alternate system using bios drive selection
•verify correct booting
•boot drive containing normal boot (/dev/sdc) with grub 1:2.02.beta2-5
•select alternate system from grub menu "Ubuntu (on /dev/sda1)" line 221 in grub.cfg
•get error message from grub and boot failure