Unable to install Real-Time Kernel Package

I am trying to follow the instructions on installing the pre-empt RT kernel through apt found here:

Installing the jetson linux real-time kernel package

However the package seems to not be available as I get the following error:

() $ sudo apt update
Hit:1 http://packages.ros.org/ros2/ubuntu focal InRelease
Hit:2 http://ports.ubuntu.com/ubuntu-ports focal InRelease                                                 
Get:3 https://repo.download.nvidia.com/jetson/common r35.1 InRelease [2,555 B]                             
Get:4 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease [114 kB]
Get:5 https://repo.download.nvidia.com/jetson/t194 r35.1 InRelease [2,550 B]
Get:6 https://repo.download.nvidia.com/jetson/rt-kernel r35.1 InRelease [2,538 B]
Get:7 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease [108 kB]
Get:8 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease [114 kB]
Get:9 http://ports.ubuntu.com/ubuntu-ports focal-updates/main arm64 Packages [1,690 kB]
Get:10 http://ports.ubuntu.com/ubuntu-ports focal-updates/main arm64 DEP-11 Metadata [275 kB]
Get:11 http://ports.ubuntu.com/ubuntu-ports focal-updates/universe arm64 DEP-11 Metadata [406 kB]
Get:12 http://ports.ubuntu.com/ubuntu-ports focal-backports/main arm64 DEP-11 Metadata [7,984 B]
Get:13 http://ports.ubuntu.com/ubuntu-ports focal-backports/universe arm64 DEP-11 Metadata [30.5 kB]
Get:14 http://ports.ubuntu.com/ubuntu-ports focal-security/main arm64 DEP-11 Metadata [59.9 kB]
Get:15 http://ports.ubuntu.com/ubuntu-ports focal-security/universe arm64 DEP-11 Metadata [93.5 kB]
Fetched 2,906 kB in 5s (610 kB/s)            
Reading package lists... Done
Building dependency tree       
Reading state information... Done
38 packages can be upgraded. Run 'apt list --upgradable' to see them.
() $ sudo apt install nvidia-l4t-rt-kernel nvidia-l4t-rt-kernel-headers
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package nvidia-l4t-rt-kernel
E: Unable to locate package nvidia-l4t-rt-kernel-headers

Checking back it seems that R32.6 has the package but it’s not available in newer releases. Can you please advise if this is intended or its missing? Thank you.

This is intended. For Jetpack 5(r35.x) releases, please manually apply the RT kernel patches to build kernel image.

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