installer crashed while completing disk partitioning

[steve lubbs]

I was installing 20.04 on USB over 17.10. Separate partitions for / (100 GB), /boot (35 GB), and swap (16 GB). efi partition 100 GB. First attempt I checked the box for format for / and /boot. Installer hung and I rebooted to to main drive and couldn't find efi partition. Tried install again and it crashed. And here we are. No syslog or partman log because you don't give instructions to do so until I get here and it's too late. Sorry.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperVersion: 1.445
Date: Sun Aug 16 20:47:48 2020
InstallCmdLine: BOOT_IMAGE=(hd0,gpt4)/casper/vmlinuz boot=casper quiet splash fsck.mode=skip persistent --
LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)