Issues with latest initramfs-tools update from apt - Ubuntu 20.04 Focal

Hello, having an issue with initramfs-tools failing to install after a generic sudo apt update && sudo apt upgrade on a working system.

Errors:

Processing triggers for initramfs-tools (0.136ubuntu6.3) ...
ln: failed to create hard link '/boot/initrd.img-4.4.154-110-rockchip-gcef30e88a9f5.dpkg-bak' => '/boot/initrd.img-4.4.154-110-rockchip-gcef30e88a9f5': Operation not permitted
update-initramfs: Generating /boot/initrd.img-4.4.154-110-rockchip-gcef30e88a9f5
Error 24 : Write error : cannot write compressed block
E: mkinitramfs failure cpio 141 lz4 -9 -l 24
update-initramfs: failed for /boot/initrd.img-4.4.154-110-rockchip-gcef30e88a9f5 with 1.
dpkg: error processing package initramfs-tools (--configure):
 installed initramfs-tools package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 initramfs-tools
E: Sub-process /usr/bin/dpkg returned an error code (1)

Kernel: 4.4.154-110-rockchip-gcef30e88a9f5

Booting from 32GB eMMC:

NAME         MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
mmcblk1      179:0    0 28.9G  0 disk
|-mmcblk1p1  179:1    0  3.9M  0 part
|-mmcblk1p2  179:2    0    4M  0 part
|-mmcblk1p3  179:3    0    4M  0 part
|-mmcblk1p4  179:4    0  112M  0 part /boot
 -mmcblk1p5  179:5    0 28.8G  0 part /
mmcblk1boot0 179:32   0    4M  1 disk
mmcblk1boot1 179:64   0    4M  1 disk
mmcblk1rpmb  179:96   0    4M  0 disk

Any suggestions? Coming up short on my Google-fu.

Looks like I may have fixed it by moving out the old kernel (4.4.154-59) to make some space in /boot, reduced from 77M to 42M. Still received the error about the hardlink failing, but then the update proceeded.

Leaving this here in case anyone else runs into the same issues.