Comment 30 for bug 1968154

I had the same issue as bmaupin

/boot$ df -h .
Filesystem Size Used Avail Use% Mounted on
bpool/BOOT/ubuntu_azukaj 1.1G 590M 476M 56% /boot

/boot$ ls -lart
total 603325
drwxr-xr-x 4 root root 4096 1月 1 1970 efi
-rw-r--r-- 1 root root 184980 2月 7 2022 memtest86+_multiboot.bin
-rw-r--r-- 1 root root 184476 2月 7 2022 memtest86+.elf
-rw-r--r-- 1 root root 182800 2月 7 2022 memtest86+.bin
drwxr-xr-x 19 root root 25 10月 8 2022 ..
-rw------- 1 root root 6261790 5月 15 22:10 System.map-5.15.0-73-generic
-rw-r--r-- 1 root root 261914 5月 15 22:10 config-5.15.0-73-generic
-rw------- 1 root root 11574280 5月 15 22:50 vmlinuz-5.15.0-73-generic
-rw-r--r-- 1 root root 133982499 7月 13 13:28 initrd.img-5.15.0-73-generic
-rw------- 1 root root 6273612 8月 14 18:05 System.map-5.15.0-83-generic
-rw-r--r-- 1 root root 262053 8月 14 18:05 config-5.15.0-83-generic
-rw------- 1 root root 11615656 8月 14 18:07 vmlinuz-5.15.0-83-generic
-rw------- 1 root root 7967590 8月 16 18:42 System.map-6.2.0-31-generic
-rw-r--r-- 1 root root 275587 8月 16 18:42 config-6.2.0-31-generic
-rw------- 1 root root 13796616 8月 16 21:43 vmlinuz-6.2.0-31-generic
-rw------- 1 root root 7969006 8月 18 18:38 System.map-6.2.0-32-generic
-rw-r--r-- 1 root root 275587 8月 18 18:38 config-6.2.0-32-generic
-rw------- 1 root root 13791304 8月 18 18:40 vmlinuz-6.2.0-32-generic
-rw-r--r-- 1 root root 145066694 9月 3 06:34 initrd.img-6.2.0-31-generic
-rw-r--r-- 1 root root 132973394 9月 11 11:53 initrd.img-5.15.0-83-generic
lrwxrwxrwx 1 root root 25 9月 11 11:57 vmlinuz.old -> vmlinuz-5.15.0-83-generic
lrwxrwxrwx 1 root root 24 9月 11 11:57 vmlinuz -> vmlinuz-6.2.0-32-generic
lrwxrwxrwx 1 root root 28 9月 11 11:57 initrd.img.old -> initrd.img-5.15.0-83-generic
lrwxrwxrwx 1 root root 27 9月 11 11:57 initrd.img -> initrd.img-6.2.0-32-generic
-rw-r--r-- 1 root root 145040737 9月 11 11:58 initrd.img-6.2.0-32-generic
drwxr-xr-x 4 root root 27 9月 11 12:01 .
drwxr-xr-x 5 root root 4096 9月 21 11:53 grub

so I tried

/boot$ sudo apt purge linux-image-5.15.0-73-generic linux-headers-5.15.0-73-generic
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  linux-image-unsigned-5.15.0-73-generic
Suggested packages:
  fdutils linux-doc | linux-source-5.15.0 linux-tools linux-headers-5.15.0-73-generic
The following packages will be REMOVED:
  linux-headers-5.15.0-73-generic* linux-image-5.15.0-73-generic*
The following NEW packages will be installed:
  linux-image-unsigned-5.15.0-73-generic
0 upgraded, 1 newly installed, 2 to remove and 213 not upgraded.
Need to get 11.7 MB of archives.
After this operation, 24.3 MB disk space will be freed.
Do you want to continue? [Y/n] y
Get:1 http://jp.archive.ubuntu.com/ubuntu jammy-updates/main amd64 linux-image-unsigned-5.15.0-73-generic amd64 5.15.0-73.80 [11.7 MB]
Fetched 11.7 MB in 5s (2,290 kB/s)
(Reading database ... 419503 files and directories currently installed.)
Removing linux-headers-5.15.0-73-generic (5.15.0-73.80) ...
dpkg: linux-image-5.15.0-73-generic: dependency problems, but removing anyway as you requested:
 linux-modules-extra-5.15.0-73-generic depends on linux-image-5.15.0-73-generic | linux-image-unsigned-5.15.0-73-generic; however:
  Package linux-image-5.15.0-73-generic is to be removed.
  Package linux-image-unsigned-5.15.0-73-generic is not installed.
 linux-modules-5.15.0-73-generic depends on linux-image-5.15.0-73-generic | linux-image-unsigned-5.15.0-73-generic; however:
  Package linux-image-5.15.0-73-generic is to be removed.
  Package linux-image-unsigned-5.15.0-73-generic is not installed.

Removing linux-image-5.15.0-73-generic (5.15.0-73.80) ...
/etc/kernel/prerm.d/dkms:
dkms: removing: virtualbox 6.1.38 (5.15.0-73-generic) (x86_64)
Module virtualbox-6.1.38 for kernel 5.15.0-73-generic (x86_64).
Before uninstall, this module version was ACTIVE on this kerne