On an HP EliteBook 840 G6 I had the same issue with Kernel 5.3.0-20 -> 23.25~18.04.1, that was solved with 5.3.0-23.25~18.04.2.
But since an update was released, version 5.3.0-24.26~19.04.2, that broke the boot again with a kernel panic. I didn't find the log of the kernel panic, so sadly I can't provide it right now (I've looked in /var/log/syslog, /var/log/kern.log and /var/log/boot.log).
On an HP EliteBook 840 G6 I had the same issue with Kernel 5.3.0-20 -> 23.25~18.04.1, that was solved with 5.3.0-23. 25~18.04. 2.
But since an update was released, version 5.3.0-24. 26~19.04. 2, that broke the boot again with a kernel panic. I didn't find the log of the kernel panic, so sadly I can't provide it right now (I've looked in /var/log/syslog, /var/log/kern.log and /var/log/boot.log).