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[giacof <1318951@xxxxxxxxxxxxxxxxxx>]

I had the same issue with kernel 3.13.0-40.69.
I could successfully update the kernel by editing the configuration file /etc/kernel-img.conf as follows:

do_symlinks = no

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https://bugs.launchpad.net/bugs/1318951

Title:
  kernel update fails with /boot on FAT32

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  My latest system upgrade failed because it can't upgrade the kernel:

    $sudo env LANGUAGE=en_US 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-signed-image-3.13.0-24-generic : Depends: linux-image-3.13.0-24-generic (= 3.13.0-24.47) but 3.13.0-24.46 is installed
    E: Unmet dependencies. Try using -f.

  When trying to install linux-image-3.13.0-24-generic manually it fails
  because it can't create a backup link for the old kernel. This really
  doesn't surprise me, because /boot is on a fat32 filesystem ( EFI
  System Partition ) so it shouldn't be possible to create any links at
  all.

  My fstab entries for boot are as follows:
    UUID=0E1E-3E58    /mnt/efi      vfat    defaults     0  2
    /mnt/efi/ubuntu     /boot           none  bind            0 0

  Here is the output of me trying to install the kernel manually:

    $sudo env LANGUAGE=en_US apt-get install linux-image-3.13.0-24-generic
    Reading package lists... Done
    Building dependency tree
    Reading state information... Done
    The following packages were automatically installed and are no longer required:
      efibootmgr secureboot-db shim
    Use 'apt-get autoremove' to remove them.
    Suggested packages:
      fdutils linux-doc-3.13.0 linux-source-3.13.0 linux-tools
    Recommended packages:
      grub-pc grub-efi-amd64 grub-efi-ia32 grub lilo
    The following packages will be upgraded:
      linux-image-3.13.0-24-generic
    1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
    114 not fully installed or removed.
    Need to get 0 B/15,0 MB of archives.
    After this operation, 1.024 B disk space will be freed.
    (Reading database ... 205799 files and directories currently installed.)
    Preparing to unpack .../linux-image-3.13.0-24-generic_3.13.0-24.47_amd64.deb ...
    Done.
    Unpacking linux-image-3.13.0-24-generic (3.13.0-24.47) over (3.13.0-24.46) ...
    dpkg: error processing archive /var/cache/apt/archives/linux-image-3.13.0-24-generic_3.13.0-24.47_amd64.deb (--unpack):
    unable to make backup link of `./boot/vmlinuz-3.13.0-24-generic' before installing new version: Operation not permitted
    dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
    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_3.13.0-24.47_amd64.deb
    E  : Sub-process /usr/bin/dpkg returned an error code (1)

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