Trying to update kernel

[rlevensa]

I installed Bionic Containers aarch64 (DockerCE & Kubernetes) [microSD / eMMC Boot] [0.7.9] image.  I'm booting from a microSD.  I must be missing something obvious, but I can't boot to a different kernel.


The kernel install looks good.

Code:

sudo apt install linux-image-4.14.0-rockchip-ayufan-136-gee91453
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
 linux-image-4.14.0-rockchip-ayufan-136-gee91453
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/10.9 MB of archives.
After this operation, 41.6 MB of additional disk space will be used.
Selecting previously unselected package linux-image-4.14.0-rockchip-ayufan-136-gee91453.
(Reading database ... 48989 files and directories currently installed.)
Preparing to unpack .../linux-image-4.14.0-rockchip-ayufan-136-gee91453_0.5.15_arm64.deb ...
Unpacking linux-image-4.14.0-rockchip-ayufan-136-gee91453 (0.5.15) ...
Setting up linux-image-4.14.0-rockchip-ayufan-136-gee91453 (0.5.15) ...
update-initramfs: Generating /boot/initrd.img-4.14.0-rockchip-ayufan-136-gee91453
Creating new extlinux.conf...
Installing new extlinux.conf...

The extlinux.conf has the new kernel information. 

Code:

cat /boot/extlinux/extlinux.conf
timeout 10
menu title select kernel
default kernel-4.13.0-rc1-rockchip-ayufan-102-g6104f84

label kernel-4.14.0-rockchip-ayufan-136-gee91453
   kernel /boot/vmlinuz-4.14.0-rockchip-ayufan-136-gee91453
   initrd /boot/initrd.img-4.14.0-rockchip-ayufan-136-gee91453
   devicetreedir /boot/dtbs/4.14.0-rockchip-ayufan-136-gee91453
   append rw panic=10 init=/sbin/init coherent_pool=1M ethaddr=${ethaddr} eth1addr=${eth1addr} serial=${serial#} cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory swapaccount=1 root=LABEL=linux-root rootwait rootfstype=ext4

label kernel-4.14.0-rockchip-ayufan-136-gee91453-memtest
   kernel /boot/vmlinuz-4.14.0-rockchip-ayufan-136-gee91453
   initrd /boot/initrd.img-4.14.0-rockchip-ayufan-136-gee91453
   devicetreedir /boot/dtbs/4.14.0-rockchip-ayufan-136-gee91453
   append rw panic=10 init=/sbin/init coherent_pool=1M ethaddr=${ethaddr} eth1addr=${eth1addr} serial=${serial#} cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory swapaccount=1 root=LABEL=linux-root rootwait rootfstype=ext4 memtest

After rebooting, it still has the original kernel.

uname -r

4.4.132-1075-rockchip-ayufan-ga83beded8524

Thanks for any help!