Comment 0 for bug 1356569

flash-kernel has logic that tries to determine "is this kernel the latest", so that it will only flash the latest kernel.
It also has logic that white-lists certain kernel flavors.

However, when it determines "is this the latest kernel", it does not apply the whitelist.
This causes issues if you have other kernels installed that are "newer" but would be ignored.

See the maas/curtin install log at http://paste.ubuntu.com/7955339/

Specifically, it says:
| Examining /etc/kernel/postinst.d.
| run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.13.0-8-keystone /boot/vmlinuz-3.13.0-8-keystone
| run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.13.0-8-keystone /boot/vmlinuz-3.13.0-8-keystone
| update-initramfs: Generating /boot/initrd.img-3.13.0-8-keystone
| df: Warning: cannot read table of mounted file systems: No such file or directory
| run-parts: executing /etc/kernel/postinst.d/update-notifier 3.13.0-8-keystone /boot/vmlinuz-3.13.0-8-keystone
| run-parts: executing /etc/kernel/postinst.d/x-grub-legacy-ec2 3.13.0-8-keystone /boot/vmlinuz-3.13.0-8-keystone
| Searching for GRUB installation directory ... found: /boot/grub
| Searching for default file ... found: /boot/grub/default
| Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
| Searching for splash image ... none found, skipping ...
| Ignoring non-Xen Kernel on Xen domU host: vmlinuz-3.13.0-8-keystone
| Found kernel: /boot/vmlinuz-3.13.0-32-generic
| Updating /boot/grub/menu.lst ... done
|
| run-parts: executing /etc/kernel/postinst.d/zz-flash-kernel 3.13.0-8-keystone /boot/vmlinuz-3.13.0-8-keystone
| Ignoring old or unknown version 3.13.0-8-keystone (latest is 3.13.0-32-generic)
| Setting up linux-headers-3.13.0-8-keystone (3.13.0-8.12) ...
| Setting up linux-headers-keystone (3.13.0.8.7) ...
| Setting up linux-image-keystone (3.13.0.8.7) ...
| Setting up linux-keystone (3.13.0.8.7) ...
| Leaving 'diversion of /etc/init/ureadahead.conf to /etc/init/ureadahead.conf.disabled by cloud-init'
| update-initramfs: Generating /boot/initrd.img-3.13.0-32-generic
| df: Warning: cannot read table of mounted file systems: No such file or directory
| Kernel suffix generic does not match any of the expected flavors (keystone), therefore not writing it to flash.

Note that it decides not to flash -generic kernel because it is not in the whitelist, but does ignores keystone kernel because it is not the newest. Result is that nothing is installed.