Steps:
1. Open installer
2. Click continue until you reach the 'Installation type' slide
3. Select 'Something else' radio button and click 'install now'
4. Partition column grid appears but the 'System' column isnt very useful
Replace 'System' column with the partition label like in Gparted, which is the name of the partition on the desktop and file manager.
Tested on Xubuntu 19.10 daily 06-23
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu3
Architecture: amd64
CurrentDesktop: XFCE
DistroRelease: Ubuntu 19.10
InstallCmdLine: BOOT_IMAGE=/multiboot/xubuntu-19.10-daily-06-23-desktop-amd64/casper/vmlinuz file=/cdrom/multiboot/xubuntu-19.10-daily-06-23-desktop-amd64/preseed/xubuntu.seed cdrom-detect/try-usb=true noprompt floppy.allowed_drive_mask=0 ignore_uuid live-media-path=/multiboot/xubuntu-19.10-daily-06-23-desktop-amd64/casper/ initrd=/multiboot/xubuntu-19.10-daily-06-23-desktop-amd64/casper/initrd quiet splash ---
Package: ubiquity 19.10.5
PackageArchitecture: amd64
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.0.0-17.18-generic 5.0.8
Tags: eoan ubiquity-19.10.5 xubuntu
Uname: Linux 5.0.0-17-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
apport information