Ubiquity crashes on formatting

[Cat Stevens]

Trying to install Ubuntu from a Live envrionment via Ubiquity results in Ubiquity crashing, with nothing out of order written to the logs or the console.

Steps to reproduce:

1. Boot a LiveCD running any of the following official flavours: Ubuntu Desktop, Ubuntu GNOME, Ubuntu MATE, Kubuntu, Xubuntu, and Lubuntu.

2. Run Ubiquity to install the system onto a blank disk.

3. Ubiquity is laggy and very slow, and doesn't connect to wifi or agree that there's an internet connection, though there is one. (Perhaps I should file another report?)

4. Select any option to install Ubuntu: "Something Else", "Erase Disk and Install Ubuntu" and "Install Ubuntu Alongside ..." all have the same effect, which is that Ubiquity exits with a status of 0.

Additionally, running Ubiquity as ubiquity --only --debug --pdb doesn't alter the outcome at all.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubiquity 2.21.37
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
CasperVersion: 1.365
CurrentDesktop: MATE
Date: Fri Dec 25 10:50:41 2015
InstallCmdLine: file=/cdrom/preseed/ubuntu-mate.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu-MATE 15.10 "Wily Werewolf" - Release amd64 (20151021)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Cat Stevens (thebinaryminer)]

I'm marking this bug as Invalid because it turns out there was a different, unrelated cause.