Comment 5 for bug 721147

Worked fine for me:

linaro@linaro:~/kernel$ dpkg -l | grep flash-kernel
ii flash-kernel 2.28ubuntu20 utility to make certain embedded devices bootable
linaro@linaro:~/kernel$ cd

linaro@linaro:~/kernel$ ls -l /boot/
total 21028
-rw------- 1 root root 2008637 May 24 03:32 System.map-2.6.38-1003-linaro-omap
-rw-r--r-- 1 root root 525199 May 24 03:32 abi-2.6.38-1003-linaro-omap
-rw-r--r-- 1 root root 361 May 24 05:14 boot.script
-rw-r--r-- 1 root root 94559 May 24 03:32 config-2.6.38-1003-linaro-omap
drwxr-xr-x 2 root root 4096 May 24 06:47 dt-2.6.38-1003-linaro-omap
-rw-r--r-- 1 root root 3991086 May 24 06:48 initrd.img-2.6.38-1003-linaro-omap
-rw------- 1 root root 4196708 May 24 03:32 vmlinuz-2.6.38-1003-linaro-omap

linaro@linaro:~/kernel$ sudo flash-kernel
Using u-boot partition: /dev/mmcblk0p1
Creating backups of uImage and uInitrd... done.
Generating kernel u-boot image... done.
Generating Initramfs u-boot image... done.
Generating u-boot configuration from /boot/boot.script... done.