[Bug 2097280] [NEW] /usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file

[Benjamin Drung]

Public bug reported:

The ISO build fails with initramfs-tools 0.145ubuntu1:

```
update-initramfs: Generating /boot/initrd.img-6.12.0-12-generic
/usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
/usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
/usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
/usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
/usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
/usr/share/initramfs-tools/hooks/casper: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
E: /usr/share/initramfs-tools/hooks/casper failed with return 2.
update-initramfs: failed for /boot/initrd.img-6.12.0-12-generic with 2.
```

Full log:
https://launchpadlibrarian.net/774287312/buildlog_ubuntu_plucky_amd64_ubuntu-
server-live_BUILDING.txt.gz

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2097280

Title:
  /usr/sbin/mkinitramfs: 122: cannot open
  /sys/module/firmware_class/parameters/path: No such file

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  The ISO build fails with initramfs-tools 0.145ubuntu1:

  ```
  update-initramfs: Generating /boot/initrd.img-6.12.0-12-generic
  /usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
  /usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
  /usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
  /usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
  /usr/sbin/mkinitramfs: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
  /usr/share/initramfs-tools/hooks/casper: 122: cannot open /sys/module/firmware_class/parameters/path: No such file
  E: /usr/share/initramfs-tools/hooks/casper failed with return 2.
  update-initramfs: failed for /boot/initrd.img-6.12.0-12-generic with 2.
  ```

  Full log:
  https://launchpadlibrarian.net/774287312/buildlog_ubuntu_plucky_amd64_ubuntu-
  server-live_BUILDING.txt.gz

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