Latest Skype (2.0.0.68-1) for Debian Etch is now broken on Debian Lenny. It has previously worked perfectly for months. I'll provide as much info as I can think of.

Fatal: Cannot mix incompatible Qt libraries
Aborted

All libraries appear present:
ldd /usr/bin/skype | grep -i Qt
libQtDBus.so.4 => /usr/lib32/libQtDBus.so.4 (0xf7dd6000)
libQtGui.so.4 => /usr/lib32/libQtGui.so.4 (0xf74ea000)
libQtNetwork.so.4 => /usr/lib32/libQtNetwork.so.4 (0xf7490000)
libQtCore.so.4 => /usr/lib32/libQtCore.so.4 (0xf7265000)
libQtXml.so.4 => /usr/lib32/libQtXml.so.4 (0xf6e6d000)

The installed Qt4 packages are:
ii libqt4-assistant 4.4.0-2
ii libqt4-core 4.4.0-2
ii libqt4-dbus 4.4.0-2
ii libqt4-designer 4.4.0-2
ii libqt4-gui 4.4.0-2
ii libqt4-network 4.4.0-2
ii libqt4-opengl 4.4.0-2
ii libqt4-qt3support 4.4.0-2
ii libqt4-script 4.4.0-2
ii libqt4-sql 4.4.0-2
ii libqt4-sql-mysql 4.4.0-2
ii libqt4-svg 4.4.0-2
ii libqt4-test 4.4.0-2
ii libqt4-xml 4.4.0-2
ii libqtcore4 4.4.0-2
ii libqtgui4 4.4.0-2
ii python-qt4 4.3.3-2
ii python-qt4-common 4.3.3-2
ii qt4-qtconfig 4.4.0-2

I can see that the Python ones are out of sync, but I'd be surprised if Skype uses Python. Qt in Lenny has recently been upgraded from 4.3.4 to 4.4.0. This is the only thing I can see that might have an impact. But the error message is then bogus as I'm not mixing Qt libraries.

Can a dev have a look at this and advise please.

Using Skype under Debian Sid with no issues at all .

the version of python-qt4 is 4.3.3-3 so I don't think pyQT is your problem .

Did you try to reinstall Skype ?

For 64 bits, try to upgrade this package : ia32-libs-gtk

I woke up this morning, started skype and had this error. Running Kubuntu Hardy Heron.

I tried various solutions suggested here. Didn't have Nessus installed so that didn't help.

In the end I installed:

sudo apt-get install libqt4-gui

and related packages which SOLVED the problem.

Also using Kubuntu Hardy, i've got the same error: "Fatal: Cannot mix incompatible Qt libraries"


Checking qt's installed package on my computer, i saw that two orphans qt package's was installed (not realy orphan, installed by smplayer packages but..): libqtcore4, libqtgui4 (not libqt4-core or libqt4-gui).

By removing them, skype works now