lyx segfaults on start after update to qt 4.4.0

[Gabriel Ambuehl]

Binary package hint: lyx

After the qt 4.4.0 update I get:

$lyx
QPaintEngine::setSystemClip: Should not be changed while engine is active
QPaintEngine::setSystemClip: Should not be changed while engine is active
QWidgetPrivate::beginSharedPainter: Painter is already active

lyx: SIGSEGV signal caught
Sorry, you have found a bug in LyX. Please read the bug-reporting instructions in Help->Introduction and send us a bug report, if necessary. Thanks !
Bye.
Aborted

Recompiling lyx does not seem to help.

[Andreas Braml (a-strich-b)]

Which version of Ubuntu do you use? Which (additional) software repositories do you get software from?

[Gabriel Ambuehl (gabriel-ambuehl)]

I use hardy with -proposed, -updates, universe, multiverse.

I'm nearly sure the breakage is related to the following packages (dpkg.log
excerpt) because it's right in the time frame where it stopped working and
lyx is using qt4:

2008-05-08 07:45:33 install libqtcore4 <none> 4.4.0-1ubuntu1~hardy1
2008-05-08 07:45:35 install libqt4-xml <none> 4.4.0-1ubuntu1~hardy1
2008-05-08 07:45:35 install libqt4-dbus <none> 4.4.0-1ubuntu1~hardy1
2008-05-08 07:45:35 install libqt4-script <none> 4.4.0-1ubuntu1~hardy1
2008-05-08 07:45:35 install libqtgui4 <none> 4.4.0-1ubuntu1~hardy1

[Axel Pospischil (apos)]

This is due to enabled backports updates (unsupported).
See Bug #228067 in qt4-x11 (Ubuntu)

[Gabriel Ambuehl (gabriel-ambuehl)]

With todays qt4.4.0 update lyx started fine once, then continued to segfault.

[Alex (alex-public-account+launchpad)]

I had the same problem, Hardy 64. I was able to fix it by:

Removing backports.
sudo apt-get update
sudo apt-get remove --purge libqtcore4 libqt4-xml libqt4-dbus libqt4-script libqtgui4 libaiksaurus-1.2-data libboost-signals1.34.1 lyx-common libaiksaurus-1.2-0c2a libboost-regex1.34.1 lyx
sudo apt-get autoremove
sudo apt-get autoclean
sudo apt-get install lyx

[Christopher Barrington-Leigh (cpbl)]

Also on Hardy 64; Falcorian's suggestion worked perfectly to fix this problem for me. Thanks!
I shall be more careful using backports in the future!
c