Comment 18 for bug 1946149

Steps to reproduce:
---

Ubuntu 18.04 image in AWS r5.metal instance type.

$ lsb_release -cs
bionic

$ dmesg | grep DMI:
[ 0.000000] DMI: Amazon EC2 r5.metal/Not Specified, BIOS 1.0 10/16/2017

$ uname -rv
5.4.0-1045-aws #47~18.04.1-Ubuntu SMP Tue Apr 13 15:58:14 UTC 2021

$ sudo add-apt-repository ppa:canonical-kernel-team/ppa

$ sudo apt install linux-image-4.15.0-1113-aws

$ sudo grub-reboot 'Advanced options for Ubuntu>Ubuntu, with Linux 4.15.0-1113-aws'

$ sudo grub-editenv /boot/grub/grubenv list
next_entry=Advanced options for Ubuntu>Ubuntu, with Linux 4.15.0-1113-aws

$ sudo reboot

The system should not come back from reboot (which usually takes 10-15 minutes on r5.metal)