ubiquity crashed with GLib.GError in start_slideshow(): g-invoke-error-quark: Could not locate webkit_web_context_get_default: 'webkit_web_context_get_default': /usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.0.so.18: undefined symbol: webkit_web_context_get_default (1)

ubiquity crashed with GLib.GError in start_slideshow

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.2
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CasperVersion: 1.388
CrashCounter: 1
Date: Thu Mar 1 10:22:26 2018
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
InterpreterPath: /usr/bin/python3.6
LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180301)
ProcCmdline: /usr/bin/python3 /usr/lib/ubiquity/bin/ubiquity gtk_ui
ProcEnviron:
 TERM=unknown
 PATH=(custom, no user)
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
Python3Details: /usr/bin/python3.6, Python 3.6.4+, python3-minimal, 3.6.4-1
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', 'gtk_ui']
PythonDetails: /usr/bin/python2.7, Python 2.7.14+, python-minimal, 2.7.14-4
SourcePackage: ubiquity
Title: ubiquity crashed with GLib.GError in start_slideshow(): g-invoke-error-quark: Could not locate webkit_web_context_get_default: 'webkit_web_context_get_default': /usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.0.so.18: undefined symbol: webkit_web_context_get_default (1)
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: