skype: erro de pesquisa de símbolo: skype: undefined symbol:

Question

Estou usando o Ubuntu 12.04 32 bit, o skype costumava funcionar, mas de repente ele parou. Agora, quando tento executar através do terminal, estou recebendo este erro:

skype: symbol lookup error: skype: undefined symbol:

Eu tentei todas essas soluções:

• "skype: erro de pesquisa de símbolo: skype: símbolo indefinido"
• Incapaz de lançar o Skype em Ubuntu 13.10 64bit - Erro de pesquisa de símbolo

mas nada funcionou. Aqui está a saída de ldd /usr/bin/skype | grep Qt :

libQtDBus.so.4 => /usr/local/qt_lib/libQtDBus.so.4 (0xb581f000)
libQtWebKit.so.4 => /usr/local/qt_lib/libQtWebKit.so.4 (0xb44bf000)
libQtXml.so.4 => /usr/local/qt_lib/libQtXml.so.4 (0xb4474000)
libQtGui.so.4 => /usr/local/qt_lib/libQtGui.so.4 (0xb391b000)
libQtNetwork.so.4 => /usr/local/qt_lib/libQtNetwork.so.4 (0xb37cd000)
libQtCore.so.4 => /usr/local/qt_lib/libQtCore.so.4 (0xb34f9000)

Conteúdo de /usr/share/applications/skype.desktop :

[Desktop Entry]
Name=Skype
Comment=Skype Internet Telephony
ec=env PULSE_LATENCY_MSEC=30 LD_LIBRARY_PATH=/usr/local/qt_lib/ skype %U
Icon=skype.png
Terminal=false
Type=Application
Encoding=UTF-8
Categories=Network;Application;
MimeType=x-scheme-handler/skype;
X-KDE-Protocols=skype

EDITAR:

Erro completo:

skype: symbol lookup error: skype: undefined symbol: _ZN19QAbstractProxyModel11setItemDataERK11QModelIndexRK4QMapIi8QVariantE

dpkg --status skype

OUTPUT:

Package: skype
Status: install ok installed
Priority: extra
Section: partner/net
Installed-Size: 61
Maintainer: Steve Langasek <[email protected]>
Architecture: i386
Version: 4.3.0.37-0ubuntu0.12.04.1
Depends: skype-bin
Conffiles:
 /etc/dbus-1/system.d/skype.conf d09fd2adb2487dbaaeb97c43f6cdc08d obsolete
Description: client for Skype VOIP and instant messaging service
 Skype is software that enables the world's conversations.  Millions of
 individuals and businesses use Skype to make free video and voice calls,
 send instant messages and share files with other Skype users.  Every day,
 people also use Skype to make low-cost calls to landlines and mobiles.
 .
  * Make free Skype-to-Skype calls to anyone else, anywhere in the world.
  * Call to landlines and mobiles at great rates.
  * Group chat with up to 200 people or conference call with up to 25 others.
  * Free to download.
Homepage: http://www.skype.com