vmlinuz and initrd are missing in /boot on the Live CD

The vmlinuz and initrd files are missing from the Live CD.

According to `dpkg -l linux-image-*`, the package linux-image-5.3.0-18-generic is installed.

This package should contain vmlinuz-5.3.0-18-generic.

However, /boot/vmlinuz-5.3.0-18-generic does not exist.

The files /boot/vmlinuz and /boot/vmlinuz.old are present, but are broken symlinks to this file.

Furthermore the files /boot/initrd and /boot/initrd.old are broken symlinks to the initrd.img-5.3.0-18-generic file.

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ubuntu@ubuntu:/boot$ ls -la
total 5365
drwxr-xr-x 1 root root 60 Nov 25 07:48 .
drwxr-xr-x 1 root root 240 Jan 22 01:02 ..
-rw-r--r-- 1 root root 236454 Oct 8 16:21 config-5.3.0-18-generic
drwxr-xr-x 1 root root 60 Jan 22 01:02 grub
lrwxrwxrwx 1 root root 27 Nov 25 07:43 initrd.img -> initrd.img-5.3.0-18-generic
lrwxrwxrwx 1 root root 27 Nov 25 07:43 initrd.img.old -> initrd.img-5.3.0-18-generic
-rw-r--r-- 1 root root 182704 Jan 28 2016 memtest86+.bin
-rw-r--r-- 1 root root 184380 Jan 28 2016 memtest86+.elf
-rw-r--r-- 1 root root 184840 Jan 28 2016 memtest86+_multiboot.bin
-rw------- 1 root root 4703701 Oct 8 16:21 System.map-5.3.0-18-generic
lrwxrwxrwx 1 root root 24 Nov 25 07:43 vmlinuz -> vmlinuz-5.3.0-18-generic
lrwxrwxrwx 1 root root 24 Nov 25 07:43 vmlinuz.old -> vmlinuz-5.3.0-18-generic

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ubuntu@ubuntu:/boot$ dpkg -l linux-image-*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-=====================================-=============-============-============================>
ii linux-image-5.3.0-18-generic 5.3.0-18.19+1 amd64 Signed kernel image generic
ii linux-image-generic 5.3.0.18.21 amd64 Generic Linux kernel image
un linux-image-unsigned-5.3.0-18-generic <none> <none> (no description available)

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ubuntu@ubuntu:/boot$ file vmlinuz*
vmlinuz: broken symbolic link to vmlinuz-5.3.0-18-generic
vmlinuz.old: broken symbolic link to vmlinuz-5.3.0-18-generic

ubuntu@ubuntu:/boot$ file initrd*
initrd.img: broken symbolic link to initrd.img-5.3.0-18-generic
initrd.img.old: broken symbolic link to initrd.img-5.3.0-18-generic

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.3.0-18-generic 5.3.0-18.19+1
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu9
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 4190 F.... pulseaudio
CasperVersion: 1.432
CurrentDesktop: ubuntu:GNOME
Date: Wed Jan 22 01:09:19 2020
IwConfig:
 lo no wireless extensions.

 enp0s3 no wireless extensions.
LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20191125)
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: innotek GmbH VirtualBox
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 svgadrmfb
ProcKernelCmdLine: file=/cdrom/preseed/username.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
RelatedPackageVersions:
 linux-restricted-modules-5.3.0-18-generic N/A
 linux-backports-modules-5.3.0-18-generic N/A
 linux-firmware 1.183.2
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.board.name: VirtualBox
dmi.board.vendor: Oracle Corporation
dmi.board.version: 1.2
dmi.chassis.type: 1
dmi.chassis.vendor: Oracle Corporation
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
dmi.product.family: Virtual Machine
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH