Ubuntu dual-boot install from USB stick fails

[Donald]

Issue has happened multiple times when I try to install the latest version of Ubuntu from my USB stick. OS boots off the stick and I go through the install wizard. My Thinkpad has 2 hard drives, with the primary running Win11 beta. I installed Ubuntu on a partition on my secondary internal hard drive. The installation to my machine fails at the executing grub-install step. Oddly, that errors out but then I get a message saying installation is complete and to reboot my computer.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubiquity 21.04.19
ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
Uname: Linux 5.11.0-16-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.461
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 27 15:42:28 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LC_NUMERIC=C.UTF-8
RebootRequiredPkgs:
 linux-image-5.11.0-31-generic
 linux-base
 linux-image-5.11.0-16-generic
 linux-base
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)