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[Mickael Istria <mistria@xxxxxxxxxx>]

FYI, I used image from Aug 27th.
Are you sure SecureBoot is disabled?

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https://bugs.launchpad.net/bugs/1123403

Title:
  Installer is blocked by UEFI Secure Boot

Status in “linux” package in Ubuntu:
  Confirmed
Status in “linux” source package in Saucy:
  Confirmed

Bug description:
  The release notes for Ubuntu 12.10 claim [1] that UEFI Secure Boot is
  supported and suggest that I should expect an "it just works"
  experience on new hardware.

  However, when I try to boot an Ubuntu 12.10 64-bit bootable USB stick
  [2] on a brand-new Acer Aspire V5-171, the following message appears:

      2. USB HDD: Memorex TD Classic 003C has been blocked by the current security policy.
      [Ok]

  I have confirmed that the USB stick boots without error when I enable
  the legacy BIOS boot mode on the computer's setup screen.

  
  [1]: https://wiki.ubuntu.com/QuantalQuetzal/ReleaseNotes/UbuntuDesktop#QuantalQuetzal.2BAC8-ReleaseNotes.2BAC8-CommonInfrastructure.Secure_Boot
  [2]: http://www.ubuntu.com/download/help/create-a-usb-stick-on-windows
  --- 
  ApportVersion: 2.10.2-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     2977 F.... pulseaudio
  CasperVersion: 1.335
  DistroRelease: Ubuntu 13.10
  LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130627)
  MachineType: Acer V5-171
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/username.seed boot=casper quiet splash --
  ProcVersionSignature: Ubuntu 3.9.0-7.15-generic 3.9.7
  RelatedPackageVersions:
   linux-restricted-modules-3.9.0-7-generic N/A
   linux-backports-modules-3.9.0-7-generic  N/A
   linux-firmware                           1.109
  Tags:  saucy
  Uname: Linux 3.9.0-7-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 12/12/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.09
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Mimic
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.09
  dmi.modalias: dmi:bvnAcer:bvrV2.09:bd12/12/2012:svnAcer:pnV5-171:pvrV2.09:rvnAcer:rnMimic:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.09:
  dmi.product.name: V5-171
  dmi.product.version: V2.09
  dmi.sys.vendor: Acer

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