@JOHN VINCENT Sorry for the late reply. Yes, usually the bug verification is 
done by the person who raised the issue to confirm the problem is solved. No 
need to reinstall the entire OS for this fix, just upgrade to the desired 
kernel version. The change is currently in -proposed. Next week the new kernels 
should land in -updates.
- focal: 5.4.0-164.181
- lunar: 6.2.0-34.34
- jammy: 5.15.0-85.95

To install a kernel from -proposed, I include -proposed to the apt-repository 
list:
sudo add-apt-repository ppa:canonical-kernel-team/proposed

And then install the desired version.

You can also check this official page for more info on how to test from 
-proposed pocket.
https://wiki.ubuntu.com/Testing/EnableProposed

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https://bugs.launchpad.net/bugs/2022361

Title:
  Please enable Renesas RZ platform serial installer

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Focal:
  Fix Committed
Status in linux source package in Jammy:
  Fix Committed
Status in linux source package in Lunar:
  Fix Committed
Status in linux source package in Mantic:
  Fix Released

Bug description:
  [Impact]

  The ubuntu installer does not work via serial ports for Renesas boards like
  RZ/G2M-HiHope 
(https://www.renesas.com/us/en/products/microcontrollers-microprocessors/rz-mpus/rzg2m-hihope-rzg2m-reference-board,
 RZ/G2L, RZ/G2LC, RZ/G2UL SMARC Board 
(https://renesas.info/wiki/RZ-G/RZ-G2L_SMARC).

  The installation can be done using HDMI ports, but it would be nice to
  support installation via serial port as well.

  [Test case]

  Try to install Ubuntu on a Renesas board.

  [Fix]

  Statically build SuperH SCI(F) serial port support (with
  earlyconsole).

  [Regression potential]

  Statically building an additional driver in the kernel can make the
  kernel image bigger, potentially causing boot issues in small (arm64 /
  armhf) platforms.

  [Original bug report]

  Package: linux
  Version: Ubuntu-6.2.0-21.21
  Severity: normal
  File: /mantic/debian.master/config/annotations

  Dear Maintainer,

  The ubuntu kernel is missing a few configuration options for Renesas
  RZ/G2M MPU as below:

  #Modify the following config from m to y.

  CONFIG_SERIAL_SH_SCI=y

  #add below configuration

  CONFIG_SERIAL_SH_SCI_CONSOLE=y
  CONFIG_SERIAL_SH_SCI_EARLYCON=y

  The above changes are required in annotations file:
  "/mantic/debian.master/config/annotations"

  code location:

  https://git.launchpad.net/~ubuntu-
  
kernel/ubuntu/+source/linux/+git/mantic/tree/debian.master/config/annotations#n11372

  #Modify the following line (change 'm' to 'y')

  CONFIG_SERIAL_SH_SCI policy<{'arm64': 'y', 'armhf': 'y'}>

  #Add the following lines:

  CONFIG_SERIAL_SH_SCI_CONSOLE policy<{'arm64': 'y', 'armhf': 'y'}>
  CONFIG_SERIAL_SH_SCI_EARLYCON policy<{'arm64': 'y', 'armhf': 'y'}>

  Could you please add those configuration options to the Ubuntu kernel?

  Best Regards
  John

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