The Real-time kernel (beta) is available through UA.

Please signup on https://ubuntu.com/realtime-kernel and you will be guided 
through the process.
This process will get the user a free Ubuntu Advantage account and access to 
the RTK repos.
Enabling RT via ua enable realtime-kernel will add the new PPA under UA, 
install and configure the necessary RT modules (e.g. kernel params), and 
provide the necessary updates. Each package supported in the RT PPA will have a 
 non-RT version available in the archive (special config only in RT-enabled 
archives).
Both the base (i.e. generic) kernel in the public archive and the RT-enabled 
kernel in the separate repo will be regularly updated as per the standard 
3-week SRU cycle.

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https://bugs.launchpad.net/bugs/1970077

Title:
  efivars file system missing in Ubuntu 22.04 real-time kernel

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  In Ubuntu 22.04 generic kernel like 5.15.0-23, efivars file system is
  mounted and is visible in the output of mount command, however in
  Ubuntu 22.04 real-time kernel like 5.15.0-1005-realtime or
  5.15.0-1007-realtime, efivars file system is missing. Intel SGX
  feature relies on efivars file system to function, could u please
  investigate this issue? Thanks.

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