Mono renders non-latin characters as squares. Fonts substitution error.

Bug #673997 reported by cablop on 2010-11-11
This bug affects 3 people
Affects Status Importance Assigned to Milestone
mono (Ubuntu)

Bug Description

Binary package hint: mono

When an application is being run we expect to be able to see the non-latin characters like CJK ones.
What happens is they're being shown as empty boxes|squares.

My Ubuntu version is Maverick and i'm using the default mono and winforms packages:
- libmono2.0-cil 2.6.7-3ubuntu1
- libmono-winforms2.0-cil 2.6.7-3ubuntu1

Afaik the problem is related to WinForms or to Ubuntu itself.
Someone addressed this as an issue in thaifonts-scalable package. But as long as i'm not using that package and that issue is fixed for maverick, this is not the same bug. File /etc/fonts/conf.avail/89-ttf-thai-tlwg-synthetic.conf is not even present.

How to reproduce the issue. Lanch a mono application, like KeePass2 and type in the search box a CJK text or paste one like 我 (for chinese) or 私、わたし (for japanese). They're instantly shown as empty boxes.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: mono-runtime 2.6.7-3ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic
Uname: Linux 2.6.35-22-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Thu Nov 11 12:35:15 2010
ExecutablePath: /usr/bin/mono
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100427.1)
SourcePackage: mono

cablop (cablop) wrote :
cablop (cablop) wrote :

I've tried to use this command

> export LANG=ja
> mono KeePass.exe

then i get the following message

Gtk-WARNING **: Locale not supported by C library.
 Using the fallback 'C' locale.

cause i know the KeePass.exe support those characters, i was running it on Windows (either real or virtualized) and characters are being shown correctly. I think it is an issue in the mono libraries for Ubuntu.

some people reported there's no such issue in OpenSuSE, maybe cause other linux suse c++ rather than pure c...

is maybe this problem caused by some pure c libraries or the mono libraries in Ubuntu?

cablop (cablop) on 2010-12-10
summary: - Non latin fonts displayed in applications. Fonts substitution error.
+ Mono renders non-latin characters as squares. Fonts substitution error.

this still effects me with banshee in Ubuntu. 11.04. Will this ever work?

Du Yanning (duyanning) wrote :

KeePass on openSUSE 12.1 also suffers this problem.

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in mono (Ubuntu):
status: New → Confirmed
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