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[Daniel Risacher <1307105@xxxxxxxxxxxxxxxxxx>]

FWIW - the rebooting part of comment #8 is essential.

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https://bugs.launchpad.net/bugs/1307105

Title:
  Kernel install fails due PAE checks

Status in linux package in Ubuntu:
  Triaged

Bug description:
  [TRIAGE NOTE]
  When a user boots Ubuntu Live/Install media with 'forcepae' option, the option should automatically be added to /etc/default/grub, or kernel upgrades will refuse to install when they do not see pae capability in cpuinfo.

  [ORIGINAL REPORT]
  On Thinkpad T42 with Pentium M processor linux image upgrade fails with message "This kernel does not support a non-PAE CPU.". System was installed from  ubuntu-14.04-beta2-desktop-i386.iso with "forcepae" kernel option. After install, system works, but cannot be upgraded to laters kernel.

      root@t42:/boot# apt-get upgrade
      Reading package lists... Done
      Building dependency tree
      Reading state information... Done
      You might want to run 'apt-get -f install' to correct these.
      The following packages have unmet dependencies:
       linux-image-extra-3.13.0-24-generic : Depends: linux-image-3.13.0-24-generic but it is not installed
       linux-image-generic : Depends: linux-image-3.13.0-24-generic but it is not installed
      E: Unmet dependencies. Try using -f.

      root@t42:/boot# apt-get install -f
      Reading package lists... Done
      Building dependency tree
      Reading state information... Done
      Correcting dependencies... Done
      The following extra packages will be installed:
        linux-image-3.13.0-24-generic
      Suggested packages:
        fdutils linux-doc-3.13.0 linux-source-3.13.0 linux-tools
      The following NEW packages will be installed:
        linux-image-3.13.0-24-generic
      0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
      3 not fully installed or removed.
      Need to get 0 B/14.6 MB of archives.
      After this operation, 32.3 MB of additional disk space will be used.
      Do you want to continue? [Y/n]
      (Reading database ... 196089 files and directories currently installed.)
      Preparing to unpack .../linux-image-3.13.0-24-generic_3.13.0-24.46_i386.deb ...
      This kernel does not support a non-PAE CPU.
      dpkg: error processing archive /var/cache/apt/archives/linux-image-3.13.0-24-generic_3.13.0-24.46_i386.deb (--unpack):
       subprocess new pre-installation script returned error exit status 1
      Examining /etc/kernel/postrm.d .
      run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.13.0-24-generic /boot/vmlinuz-3.13.0-24-generic
      run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.13.0-24-generic /boot/vmlinuz-3.13.0-24-generic
      Errors were encountered while processing:
       /var/cache/apt/archives/linux-image-3.13.0-24-generic_3.13.0-24.46_i386.deb
      E: Sub-process /usr/bin/dpkg returned an error code (1)

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