Install error "/cdrom/casper" failed: Not a directory (20)

[Ruslan101]

NAME="Pop!_OS"
VERSION="20.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
LOGO=distributor-logo-pop-os

But this is also relevant for 22.04 LTS

I don't know exactly what could be causing this problem. I also can't give you instructions for reproducing it because this problem only occurs on one of my machines. So I'm just trying to install pop os but I'm getting the following error in /tmp/installer.log:

[WARN distinst:crates/chroot/src/command.rs:99] rsync: change_dir "/cdrom/casper" failed: Not a directory (20)
[ERROR distinst:src/installer/state.rs:37] configuring chroot error: error creating recovery partition: command failed with exit status: exit status: 23
[ERROR distinst:src/installer/mod.rs:300] errored while installing system: error creating recovery partition: command failed with exit status: exit status: 23
[INFO distinst:ffi/src/installer.rs:188] Install error: error creating recovery partition: command failed with exit status: exit status: 23

Full contents of the installer.log file: https://sharetext.me/pkwobiifoi

[Ruslan101]

just in case

pop-os@pop-os:~$ ls -al /cdrom/
total 192
drwxr-xr-x 10 root root  4096 Jan  1  1970  .
drwxr-xr-x  1 root root   220 Oct  1 23:12  ..
drwxr-xr-x  2 root root  4096 Oct  2  2022  .disk
drwxr-xr-x  2 root root  4096 Oct  2  2022 'System Volume Information'
-rwxr-xr-x  1 root root 34494 Oct  2  2022  autorun.ico
-rwxr-xr-x  1 root root   222 Oct  2  2022  autorun.inf
drwxr-xr-x  3 root root  4096 Oct  2  2022  boot
-rwxr-xr-x  1 root root     0 Oct  2  2022  casper
drwxr-xr-x  2 root root  4096 Oct  2  2022  casper_pop-os_20.04_amd64_intel_debug_99
drwxr-xr-x  3 root root  4096 Oct  2  2022  dists
drwxr-xr-x  3 root root  4096 Oct  2  2022  efi
drwxr-xr-x  2 root root  4096 Oct  2  2022  isolinux
-r-xr-xr-x  1 root root 69623 Oct  2  2022  ldlinux.sys
-rwxr-xr-x  1 root root 42959 Oct  2  2022  md5sum.txt
drwxr-xr-x  4 root root  4096 Oct  2  2022  pool
-rwxr-xr-x  1 root root    94 Oct  2  2022  syslinux.cfg