Issue w/ update-initramfs & fsck.lvm2 after boot-repair on lvm2 partition

[nick164]

Recently, grub had some issues which required me to rebuild it using boot-repair. This turned out to be quite the challenge as I'm using an lvm encrypted partition. Throughout the process of trying to resolve this, I tried many different things. At one point, grub finally started at boot, but Ubuntu wasn't booting properly. As one of the things that I tried to resolve the issue, I installed a newer kernel, 4.17.0-041700-generic. Somehow, update-initramfs worked successfully with this kernel, but returned the following error with all others:

Warning: /sbin/fsck.LVM2_member doesn't exist, can't install to initramfs, ignoring.

After having spent half the day getting to this point, I was happy enough that it booted properly and I was able to boot normally again. This was until I realized that Virtualbox isn't compatible with 4.17 kernels. :roll: I absolutely must have vbox working, so I've been attempting to install a 4.15 kernel and every attempt at running update-initramfs yields the following:

root@myuser:/sbin# update-initramfs -u -k all
update-initramfs: Generating /boot/initrd.img-4.17.0-041700-generic
W: Possible missing firmware /lib/firmware/amdgpu/vega12_gpu_info.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_asd.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_sos.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_rlc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_mec2.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_mec.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_me.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_pfp.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_ce.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_sdma1.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_sdma.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_uvd.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_vce.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_smc.bin for module amdgpu
Warning: /sbin/fsck.LVM2_member doesn't exist, can't install to initramfs, ignoring.
update-initramfs: Generating /boot/initrd.img-4.15.0-42-lowlatency
Warning: /sbin/fsck.LVM2_member doesn't exist, can't install to initramfs, ignoring.
update-initramfs: Generating /boot/initrd.img-4.15.0-42-generic
Warning: /sbin/fsck.LVM2_member doesn't exist, can't install to initramfs, ignoring.


As you can see, it's even giving this error when updating the 4.17 kernel now.
Below you can see the warning message result section from running update-initramfs with verbose output:

Adding module /lib/modules/4.15.0-42-generic/kernel/drivers/gpu/drm/virtio/virtio-gpu.ko
Adding module /lib/modules/4.15.0-42-generic/kernel/drivers/video/vgastate.ko
Adding module /lib/modules/4.15.0-42-generic/kernel/drivers/video/fbdev/vga16fb.ko
Calling hook fsck
Adding binary /sbin/fsck
Adding library-link /lib/x86_64-linux-gnu/libmount.so.1
Adding library /lib/x86_64-linux-gnu/libmount.so.1.1.0
Adding binary /sbin/logsave
Warning: /sbin/fsck.LVM2_member doesn't exist, can't install to initramfs, ignoring.
Calling hook fuse
Adding binary /sbin/mount.fuse
Calling hook intel_microcode


I need to get an older kernel working on this system so I can use Virtualbox again. Any help would be thoroughly appreciated. Googling that warning returns something like 6 more or less useless results. I'm pulling out my hair here.

Thanks in advance!