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I wanted to install Japanese through the gnome-control-center, so I
opened it, went to the "Region & Language" section, clicked "Language",
searched for "Japanese", when I found it I clicked on it (a tick
appeared next to it), and finally I clicked "Done". Now what then should
have happened is it should have asked me if I wanted to install the
language packs it would then present to me and I would be able to
continue with the installation... What instead happened was it hanged
for a while and then finally outputted in Terminal:

    (gnome-control-center.real:1726): common-cc-panel-WARNING **: Language 
ja_JP.UTF-8 not installed, trying to intall it
    Segmentation fault (core dumped)

The full output in Terminal was:

    ** (gnome-control-center.real:1726): WARNING **: Ignoring launcher 
landscape-client-settings (missing desktop file)
    
    ** (gnome-control-center.real:1726): WARNING **: Ignoring launcher 
language-selector (missing desktop file)
    
    ** (gnome-control-center.real:1726): WARNING **: Ignoring launcher 
ubuntuone-installer (missing desktop file)
    
    (gnome-control-center.real:1726): common-cc-panel-WARNING **: Couldn't get 
LANG locale -- Copying interrupted
    
    (gnome-control-center.real:1726): GnomeDesktop-CRITICAL **: 
gnome_get_language_from_locale: assertion '*locale != '\0'' failed
    
    (gnome-control-center.real:1726): GnomeDesktop-CRITICAL **: 
gnome_get_country_from_locale: assertion '*locale != '\0'' failed

    (gnome-control-center.real:1726): common-cc-panel-WARNING **: Couldn't get 
LANG locale -- Copying interrupted
    
    (gnome-control-center.real:1726): GnomeDesktop-CRITICAL **: 
gnome_get_language_from_locale: assertion '*locale != '\0'' failed
    
    (gnome-control-center.real:1726): common-cc-panel-WARNING **: Language 
ja_JP.UTF-8 not installed, trying to intall it
    Segmentation fault (core dumped)

I have tested this bug and it is present in Ubuntu GNOME 15.10 with
GNOME 3.18 and 16.04 with GNOME 3.19 VMs, however I cannot reproduce it
on the host (15.10 with GNOME 3.18).

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: gnome-control-center 1:3.19.90-0ubuntu1~xenial1 [origin: 
LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 4.4.0-12.28-generic 4.4.4
Uname: Linux 4.4.0-12-generic i686
ApportVersion: 2.20-0ubuntu3
Architecture: i386
CrashCounter: 1
CurrentDesktop: GNOME
Date: Sun Mar 13 20:45:54 2016
ExecutablePath: /usr/bin/gnome-control-center.real
InstallationDate: Installed on 2016-03-04 (9 days ago)
InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Alpha i386 
(20160225.1)
ProcCmdline: /usr/bin/gnome-control-center.real
SegvAnalysis:
 Segfault happened at: 0xb5b30c10 <g_utf8_validate+256>:        movzbl 
(%ebx),%eax
 PC (0xb5b30c10) ok
 source "(%ebx)" (0x13e9c381) not located in a known VMA region (needed 
readable region)!
 destination "%eax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: gnome-control-center
StacktraceTop:
 g_utf8_validate () from /lib/i386-linux-gnu/libglib-2.0.so.0
 g_variant_new_string () from /lib/i386-linux-gnu/libglib-2.0.so.0
 g_variant_new_strv () from /lib/i386-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
Title: gnome-control-center.real crashed with SIGSEGV in g_utf8_validate()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

** Affects: ubuntu-gnome
     Importance: Undecided
         Status: New

** Affects: accountsservice (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-crash gnome3-ppa gnome3-staging i386 patch third-party-packages 
xenial
-- 
gnome-control-center.real crashed with SIGSEGV in g_utf8_validate()
https://bugs.launchpad.net/bugs/1556684
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