I could not install the test kernel from
http://people.canonical.com/~henrix/lp1215155/ - Software Center
complains "wrong architecture amd64". I am in fact running i386, to be
able to boot a small netbook from the external hard drive.

The kernel in "proposed" (aptitude got me 3.8.0-30.44) works o.k., so
the bug seems to be fixed there.

The bisecting test you recommended, seems to indicate, that the bug may have 
been introduced by the step from v3.8.13.4 to v3.8.13.5. Here are my bisecting 
test notes:
installing and booting .2 => works ; removing "proposed" from software sources 
; apt-get update
installing and booting .4 => works ; removing .2 to free up space in /boot
installing and booting .6 => fails ; booting into .4, removing .6 to free up 
space in /boot
installing and booting .5 => fails ; booting into .4, removing .5 to free up 
space in /boot

Thanks for looking into this.

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  encrypted drive can't boot

Status in “linux” package in Ubuntu:

Bug description:
  Steps to reproduce:
  - install new Ubuntu (or Xubuntu) 13.04 from CD in VM on external hard drive 
mounted as /dev/sda , having selected the option to encrypt the drive.
  - reboot when install is finished, then running on a physical machine with 
the external hard drive mounted as /dev/sdb  (this setup has worked for months 
before today)
  - enter the encryption passphrase when asked (early in the boot process)
  - login as the one user set up during installation
  - install the ca. 109 MB of updates, including linux-image-3.8.0-29
  - reboot when the update process has finished
  - the graphic boot screen shows up and the waiting wheel starts turning, as 
usual, before the disk encryption passphrase is being asked for

  Observed behaviour: after ca. 3-5 minutes, with the wheel turning and
  no passphrase prompt, the system falls into a BusyBox (mini shell)
  with initramfs prompt.

  Expected behaviour: after max. 1-2 minutes, the prompt to enter the
  disk encryption passphrase should appear.

  Workaround: while still in grub, enter the advanced options and boot
  kernel version 3.8.0-19, which shows expected behaviour.

  The bug seems to appear with kernel version 3.8.0-29; kernel version
  3.8.0-19 works.

  Both vanilla Ubuntu 13.04 and Xubuntu 13.04 are affected. The
  workaround works for both Ubuntu variants.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-29-generic 3.8.0-29.42
  ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
  Uname: Linux 3.8.0-19-generic i686
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: i386
   /dev/snd/controlC1:  martin     2055 F.... pulseaudio
   /dev/snd/controlC0:  martin     2055 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  Date: Wed Aug 21 13:16:59 2013
  HibernationDevice: RESUME=UUID=6ad5cfb1-aa0f-40f6-b5a5-9cd9f3a2ebc1
  InstallationDate: Installed on 2013-08-21 (0 days ago)
  InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Release i386 (20130423.1)
   lo        no wireless extensions.
   eth1      no wireless extensions.
  MarkForUpload: True
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-19-generic 
root=/dev/mapper/xubuntu--vg-root ro quiet splash
   linux-restricted-modules-3.8.0-19-generic N/A
   linux-backports-modules-3.8.0-19-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/10/2009
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: CBQ4510H.86A.0111.2009.1210.1144
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: DQ45CB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE30148-301
  dmi.chassis.type: 3
  dmi.sys.vendor: wortmann

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