installer crashes on install.

[Lorne]

I've been trying for two days to install 20.04.1 or 20.10 into my new SSD (1T)...and I've used 2 different thumb drives - and the install hangs or crashes. Now trying with DVD-R...and it just crashed again.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.2
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckMismatches: ./dists/focal/main/binary-amd64/Packages.gz
CasperMD5CheckResult: skip
CasperVersion: 1.445.1
Date: Mon Oct 5 18:41:56 2020
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Oct 5 22:41:42 ubuntu /plugininstall.py: Traceback (most recent call last):
Oct 5 22:41:42 ubuntu /plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 297, in pulse
Oct 5 22:41:42 ubuntu /plugininstall.py: self.db.subst(self.info, 'TIME', time_str)
Oct 5 22:41:42 ubuntu /plugininstall.py: File "/usr/lib/python3/dist-packages/debconf.py", line 83, in <lambda>
Oct 5 22:41:42 ubuntu /plugininstall.py: lambda *args, **kw: self.command(command, *args, **kw))
Oct 5 22:41:42 ubuntu /plugininstall.py: File "/usr/lib/python3/dist-packages/debconf.py", line 104, in command
Oct 5 22:41:42 ubuntu /plugininstall.py: status = int(status)
Oct 5 22:41:42 ubuntu /plugininstall.py: ValueError: invalid literal for int() with base 10: ''
Oct 5 22:41:42 ubuntu /plugininstall.py: