Ubiquity got stuck creating an ext4 partition

[Istimsak]

The installation got stuck on "creating ext4 on partition x". When reading the details I saw this "/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py:131: Warning: Source ID 10820 was not found when attempting to remove it". This was found in the log file, "/var/log/installer/debig". Some network manager widget could not be removed.

ubiquity:
  Installed: 2.21.13
  Candidate: 2.21.13
  Version table:
 *** 2.21.13 0
        500 http://archive.ubuntu.com/ubuntu/ vivid/main i386 Packages
        100 /var/lib/dpkg/status

Distributor ID: Ubuntu
Description: Ubuntu Vivid Vervet (development branch)
Release: 15.04
Codename: vivid

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubiquity 2.21.13
ProcVersionSignature: Ubuntu 3.18.0-13.14-generic 3.18.5
Uname: Linux 3.18.0-13-generic i686
ApportVersion: 2.16.1-0ubuntu2
Architecture: i386
CasperVersion: 1.351
Date: Wed Feb 25 16:52:44 2015
InstallCmdLine: initrd=/casper/initrd.lz file=/cdrom/preseed/xubuntu.seed boot=casper quiet splash -- BOOT_IMAGE=/casper/vmlinuz
LiveMediaBuild: Xubuntu 15.04 "Vivid Vervet" - Alpha i386 (20150224)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
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/1425715

[Erick Brunzell (lbsolost)]

I wonder if this might be a duplicate of bug #1361951?

[Launchpad Janitor (janitor)]

[Expired for ubiquity (Ubuntu) because there has been no activity for 60 days.]