ubi-partman crashes if install updates unchecked and install third party software checked

[Heather Ellsworth]

The title pretty much sums it up. When installing xubuntu oem, I unchecked the box "Download updates while installing Xubuntu" and checked the box "Install third-party software". When I clicked continue, I get a message saying that ubi-partman crashed (see attached). If it is not allowed to have this checkbox combination, then there should be an error saying so.

Furthermore, the ubi-partman crash didn't seem to have any affect on the install. The install completed fine, even though updates WERE downloaded an installed (see #1848552).

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubiquity 19.10.21
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CurrentDesktop: XFCE
Date: Thu Oct 17 11:34:17 2019
InstallCmdLine: file=/cdrom/preseed/xubuntu.seed initrd=/casper/initrd quiet splash --- oem-config/enable=true
InstallationDate: Installed on 2019-10-17 (0 days ago)
InstallationMedia: Xubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1848554