package linux-image-4.15.0-38-generic 4.15.0-38.41 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1

Was using apt upgrade to update multiple components (I believe around 650mb) and towards the end of the installation, it was doing the headers when the error occurred. The system running is a live-boot USB with a 4gb persistence file for storage/updates. I'm thinking this might inherently be the issue, since further errors occurred with fstab telling me that it was unable to determine the root device. I've never had any issues updating headers before, but I've also never tried to perform a header update on a USB system, so I decided to report, just in case there is a larger issue.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-38-generic 4.15.0-38.41
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 1846 F.... pulseaudio
Date: Sun Oct 28 19:58:12 2018
ErrorMessage: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
MachineType: Hewlett-Packard HP Pavilion 17 Notebook PC
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/multiboot/hostname-18.04.1-desktop-amd64/casper/vmlinuz file=/cdrom/multiboot/hostname-18.04.1-desktop-amd64/preseed/hostname.seed boot=casper cdrom-detect/try-usb=true persistent persistent-path=/multiboot/hostname-18.04.1-desktop-amd64 noprompt floppy.allowed_drive_mask=0 ignore_uuid live-media-path=/multiboot/hostname-18.04.1-desktop-amd64/casper/ initrd=/multiboot/hostname-18.04.1-desktop-amd64/casper/initrd.lz quiet splash ---
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions: grub-pc 2.02-2ubuntu8.7
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: initramfs-tools
Title: package linux-image-4.15.0-38-generic 4.15.0-38.41 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/04/2014
dmi.bios.vendor: Insyde
dmi.bios.version: F.23
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 1971
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 95.33
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.23:bd06/04/2014:svnHewlett-Packard:pnHPPavilion17NotebookPC:pvr0883100000305B10000620100:rvnHewlett-Packard:rn1971:rvr95.33:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV X=Null
dmi.product.name: HP Pavilion 17 Notebook PC
dmi.product.version: 0883100000305B10000620100
dmi.sys.vendor: Hewlett-Packard