How do I change ubuntu kernel to another version on Linux Deploy?

[Janus-WD]

After I installed the ubuntu on Linux Deploy, I want to change ubuntu kernel version and kernel config.
The current kernel version is:

root@sp3:/WORK# uname -a
Linux sp3 4.19.138-g45aa54f43 #3 SMP PREEMPT Thu May 18 17:50:30 CST 2023 aarch64 aarch64 aarch64 GNU/Linux

root@sp3:/WORK# uname -r
4.19.138-g45aa54f43

But I found NOTHING in command dpkg --get-selections | grep linux-image
And the "/boot" is empty, too.

So I tried to install another kernel by sudo apt-get install linux-image-5.4.0-81-generic
And dpkg --get-selections | grep linux shows

root@sp3:/WORK# dpkg --get-selections | grep linux
binutils-aarch64-linux-gnu			install
console-setup-linux				install
libselinux1:arm64				install
linux-base					install
linux-image-5.4.0-81-generic			install
linux-libc-dev:arm64				install
linux-modules-5.4.0-81-generic			install
util-linux					install

But the uname -r is still "4.19.138-g45aa54f43"

How do I change kernel to 5.4.0-81 ?

[kloppy]

afaik you cannot switch kernels in a chroot, the kernel will always be the one that's running Android