Comment 25 for bug 1929255

Hirsute:
link_in_boot = yes

# dpkg-query -W linux-base
linux-base 4.5ubuntu5.2

# Two regular flavours
# ls -latr /boot/ | grep -- '->' | sort
lrwxrwxrwx 1 root root 25 Jun 23 10:46 vmlinuz.old -> vmlinuz-5.11.0-23-generic
lrwxrwxrwx 1 root root 28 Jun 23 10:46 vmlinuz -> vmlinuz-5.11.0-23-lowlatency
lrwxrwxrwx 1 root root 28 Jun 23 10:49 initrd.img.old -> initrd.img-5.11.0-23-generic
lrwxrwxrwx 1 root root 31 Jun 23 10:48 initrd.img -> initrd.img-5.11.0-23-lowlatency

# selfbuilt
# installkernel 5.13.0-051300rc7-generic image/boot/vmlinuz-5.13.0-051300rc7-generic modules/boot/System.map-5.13.0-051300rc7-generic
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 5.13.0-051300rc7-generic /boot/vmlinuz-5.13.0-051300rc7-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 5.13.0-051300rc7-generic /boot/vmlinuz-5.13.0-051300rc7-generic
update-initramfs: Generating /boot/initrd.img-5.13.0-051300rc7-generic
run-parts: executing /etc/kernel/postinst.d/xx-update-initrd-links 5.13.0-051300rc7-generic /boot/vmlinuz-5.13.0-051300rc7-generic
I: /boot/initrd.img.old is now a symlink to initrd.img-5.11.0-23-lowlatency
I: /boot/initrd.img is now a symlink to initrd.img-5.13.0-051300rc7-generic

# ls -latr /boot/ | grep -- '->' | sort
lrwxrwxrwx 1 root root 28 Jun 23 10:46 vmlinuz.old -> vmlinuz-5.11.0-23-lowlatency
lrwxrwxrwx 1 root root 31 Jun 23 10:52 initrd.img.old -> initrd.img-5.11.0-23-lowlatency
lrwxrwxrwx 1 root root 32 Jun 23 10:52 vmlinuz -> vmlinuz-5.13.0-051300rc7-generic
lrwxrwxrwx 1 root root 35 Jun 23 10:52 initrd.img -> initrd.img-5.13.0-051300rc7-generic