installer crashes when performing "clean" install

[Sumiya Tanahashi]

When trying to delete all data from partition to install OS, the installer unexpectedly crashed. When attempting to continue to reformat harddrive and install Ubuntu Studio, the installer would go back 1 or 2 steps, repeating the process, then crash after selecting an install type.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.4
ProcVersionSignature: Ubuntu 4.10.0-28.32~16.04.2-lowlatency 4.10.17
Uname: Linux 4.10.0-28-lowlatency i686
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: i386
CasperVersion: 1.376.2
Date: Wed Apr 18 13:02:12 2018
InstallCmdLine: file=/cdrom/preseed/ubuntustudio.seed boot=casper only-ubiquity initrd=/casper/initrd.lz quiet splash ---
LiveMediaBuild: Ubuntu-Studio 16.04.3 LTS "Xenial Xerus" - Release i386 (20170801)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)