Public bug reported:

After installing two side-by-side quantal installations with 20120913.1
- amd64+mac desktop on a mac mini, it is impossible to boot to the first
quantal installation.

Pressing down arrow key at the grub menu does not change anything and
the menu timesout with the default 10 seconds and boots with the latest
(second in this case) ubuntu installation.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-14-generic 3.5.0-14.16
ProcVersionSignature: Ubuntu 3.5.0-14.16-generic 3.5.3
Uname: Linux 3.5.0-14-generic x86_64
AcpiTables: Error: command ['pkexec', '/usr/share/apport/dump_acpi_tables.py'] 
failed with exit code 127: Error executing 
/usr/share/apport/dump_acpi_tables.py: Permission denied
ApportVersion: 2.5.1-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ubuntu2    1873 F.... pulseaudio
Date: Thu Sep 13 14:41:59 2012
HibernationDevice: RESUME=UUID=e62441a3-3cab-4c4d-b104-51d6c90a7d63
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64+mac (20120913.1)
IwConfig:
 eth0      no wireless extensions.
 
 lo        no wireless extensions.
MachineType: Apple Inc. Macmini5,1
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-14-generic 
root=UUID=8fded063-1ef0-4918-8e41-c9a45bb40620 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-14-generic N/A
 linux-backports-modules-3.5.0-14-generic  N/A
 linux-firmware                            1.91
RfKill:
 0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/20/2011
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MM51.88Z.0077.B0F.1110201309
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-8ED6AF5B48C039E1
dmi.board.vendor: Apple Inc.
dmi.board.version: Macmini5,1
dmi.chassis.type: 16
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-8ED6AF5B48C039E1
dmi.modalias: 
dmi:bvnAppleInc.:bvrMM51.88Z.0077.B0F.1110201309:bd10/20/2011:svnAppleInc.:pnMacmini5,1:pvr1.0:rvnAppleInc.:rnMac-8ED6AF5B48C039E1:rvrMacmini5,1:cvnAppleInc.:ct16:cvrMac-8ED6AF5B48C039E1:
dmi.product.name: Macmini5,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug qa-manual-testing quantal running-unity

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https://bugs.launchpad.net/bugs/1050436

Title:
  Up/Down arrow keys are not recognized during the grub menu on
  amd64+mac

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