apt-get install kernel-cssu-bootimg
Reading package lists... Done
Building dependency tree
Reading state information... Done
Recommended packages:
multiboot usbip kexec-tools
The following NEW packages will be installed:
kernel-cssu-bootimg
0 upgraded, 1 newly installed, 0 to remove and 3 not upgraded.
Need to get 0B/1937kB of archives.
After this operation, 2015kB of additional disk space will be used.
Selecting previously deselected package kernel-cssu-bootimg.
(Reading database ... 24919 files and directories currently installed.)
Unpacking kernel-cssu-bootimg (from .../kernel-cssu-bootimg_1%3a2.6.28-10cssu3_armel.deb) ...
Setting up kernel-cssu-bootimg (1:2.6.28-10cssu3) ...
Adding bootmenu entry for: Maemo 5 with attached kernel 2.6.28-omap1 (Internal Nand)

Configuration file: /etc/bootmenu.d/20-Maemo5-kernel-cssu-2.6.28.10-cssu3.item
Generating u-boot image for kernel 'zImage-2.6.28.10-cssu3'...
Adding bootmenu entry for: 'Maemo 5 with kernel-cssu 2.6.28.10-cssu3 (Internal Nand)'

Configuration file: /etc/bootmenu.d/20-Maemo5-kernel-power-2.6.28.10-power50.item
Error: Kernel image '2.6.28.10-power50' was not found in /boot

Configuration file: /etc/bootmenu.d/backupmenu.item
Error: Invalid file - missing kernel or script file

Configuration file: /etc/bootmenu.d/recovery.item
Error: Invalid file - missing kernel or script file

Generating u-boot bootmenu script...