[Bug 1802260] [NEW] Please include modules for NVMe and USB HID in pc-kernel snap initrd

Public bug reported:

When trying Ubuntu Core with the pc-kernel snap, the system showed
'cannot find writable partition'. The system was stopped at the initrd
stage and didn't accept any input.

My system is using a NVMe disk and it seems the pc-kernel doesn't
provide the related modules in its initrd. Also, it's not possible to
enter the initramfs environment because of the lacking of USB HID
modules.

Is it possible to include these two categories of drivers in the initrd
of pc-kernel, please?

Verified both 4.4 and 4.15 (track 18) have the same issue.
$ squashfuse pc-kernel_162.snap pc-kernel
$ lsinitramfs pc-kernel/initrd.img |grep -E 'nvme|usbhid'
[nothing is showed]
$ fusermount -u pc-kernel
$ squashfuse pc-kernel_165.snap pc-kernel
$ lsinitramfs pc-kernel/initrd.img |grep -E 'nvme|usbhid'
[nothing is showed]
$ fusermount -u pc-kernel

** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete

** Summary changed:

- Please include modules for NVMe and USBHID in pc-kernel snap initrd
+ Please include modules for NVMe and USB HID in pc-kernel snap initrd

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https://bugs.launchpad.net/bugs/1802260

Title:
Please include modules for NVMe and USB HID in pc-kernel snap initrd

Status in linux package in Ubuntu:
Incomplete

Bug description:
When trying Ubuntu Core with the pc-kernel snap, the system showed
'cannot find writable partition'. The system was stopped at the initrd
stage and didn't accept any input.

My system is using a NVMe disk and it seems the pc-kernel doesn't
provide the related modules in its initrd. Also, it's not possible to
enter the initramfs environment because of the lacking of USB HID
modules.

Is it possible to include these two categories of drivers in the
initrd of pc-kernel, please?

Verified both 4.4 and 4.15 (track 18) have the same issue.
$ squashfuse pc-kernel_162.snap pc-kernel
$ lsinitramfs pc-kernel/initrd.img |grep -E 'nvme|usbhid'
[nothing is showed]
$ fusermount -u pc-kernel
$ squashfuse pc-kernel_165.snap pc-kernel
$ lsinitramfs pc-kernel/initrd.img |grep -E 'nvme|usbhid'
[nothing is showed]
$ fusermount -u pc-kernel

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