On a 64-bit install, 32-bit apps will not be skinned by this engine

[Craig Magina]

Binary package hint: gtk2-engines-qtcurve

I see the issue when using java apps and adobe air apps on an amd64 Kubuntu install.
I know all of these apps are fine when used on a 32-bit install of Kubuntu.

Specific apps I see this with:
Cisco AnyConnect
Pandora (the certification accept pop-up)

[Jonathan Thomas (echidnaman)]

Java and Adobe Air are GUI toolkits in and of themselves, and are not GTK apps.

[Craig Magina (craig.magina)]

Here is the error these apps output:

(Pandora:5513): Gtk-WARNING **: /usr/lib/gtk-2.0/2.10.0/engines/libqtcurve.so: wrong ELF class: ELFCLASS64

Not sure how this could be worked around. Any way to get gtk to use different theme engines based on the apps build architecture?

[Craig Magina (craig.magina)]

I found some help towards a solution here:
http://ubuntuforums.org/showthread.php?t=159810

So, after extracting the 32-bit version of libqtcurve.so, I copied it to the /usr/lib32/gtk-2.0/2.10.0/engines/ and everything is working fine now. It appears we install a bunch of 32-bit themes already as that path was already created and populated with other themes, it just didn't have qtcuve in there.

[Craig Magina (craig.magina)]

Ok, so I used a downloaded copy of the i686 firefox for my example of the issue I am seeing here. I've attached two screenshots, one is what you see in a default Kubuntu amd64 system and the other is after I installed the 32-bit version of the libqtcurve.so gtk engine.

Firefox emits the same Gtk-WARNING as Pandora.

Gtk-WARNING **: /usr/lib/gtk-2.0/2.10.0/engines/libqtcurve.so: wrong ELF class: ELFCLASS64

ia32-libs installs base gtk engines, 32-bit versions, but it doesn't include qtcurve, which I would expect. I do not know how to solve the problem, but the solution is to include a 32-bit version of libqtcurve.so for 64-bit Kubuntu systems. Putting the engine in ia32-libs doesn't seem like the correct location as that is used by Ubuntu as well whereas this change is specific to Kubuntu.

I am willing to do the work, just not sure what that work is. Is there a Kubuntu specific package that is installed for 32-bit compatibility on 64-bit systems?

[Craig Magina (craig.magina)]

Looks like the gtk2-engines-qtcurve package can just be added to the ia32-libs package. I downloaded the sources and checked out what it already includes, which is quite a lot. I'll give it a shot at creating a patch for the package, unless this isn't actually the correct way to fix this.

[Jonathan Thomas (echidnaman)]

Feh, didn't mean to change that to invalid.

[Craig Magina (craig.magina)]

I've attached a debdiff that is my proposed solution to this problem. I have tested the generated package and it worked successfully.

[Adam Guthrie (therigu)]

There's now a 2.7ubuntu26 in lucid-proposed so could you refresh your patch to be 2.7ubuntu27?

[Craig Magina (craig.magina)]

Here is the updated patch.

[Stefano Rivera (stefanor)]

This bug was fixed in the package ia32-libs - 20090808ubuntu1

---------------

  * Merge with Debian unstable. (LP: #618666) Remaining Ubuntu changes:
    - sources.list.deb: Debian -> Ubuntu archive apt sources.
    - Add debian/pango.modules and install them in debian/rules.
    - debian/rules:
      + Depend on lib32bz2-1.0 on amd64 instead of shipping it.
      + Depend on lib32v4l package
      + Automatically create all missing .so symlinks in /lib32
        and /usr/lib32 as the manual list of links was always out of sync and
        incomplete (LP: #277772, #309841).
      + Remove the automatically created libstdc++.so symlink, it's not needed.
        g++-4.3-multilib provides the right symlink (LP: #360870)
      + Add gvfs and symlinks for gio (LP: #369498)
      + Add symlink to libGL.so for Wine building (LP: #513554)
      + Compress packages with LZMA
    - debian/rules, debian/ia32-libs.conf: Add /lib32 and /usr/lib32 to ld
      search path.
    - fetch-and-build:
      + fetch-and-build: Add packages we want/need in Ubuntu. This also
        includes SDL and GTK, which are in separate source packages in Debian.
      + fetch-and-build: Do not die on source/binary version mismatch when
        defining $SOURCE_VER_MISMATCH. Useful right after opening a new Ubuntu
        release, when the archive is in heavy flux.
      + Dropped:
        > libartsc0 (which is now obsolete)
        > libxtrap6 (package seems to be gone from the archive)
      + Added:
        > libgsl0ldbl (LP: #130058)
        > libsmbios2 (dependency for libhal1)
        > libcelt0-0 (dependency for libjack0)
        > libmad0 (LP: #249794)
        > libvorbis0a (LP: #249794)
        > libvorbisfile3 (LP: #249794)
        > libwrap0 (LP: #290533)
  * debian/control: Don't Conflict/Replace lib32bz2-1.0, as we depend on it.
  * debian/rules: Bump GCC 4.3 to 4.5 to match new lib32gcc1
  * fetch-and-build:
    - Added: gtk2-engines-qtcurve. Thanks to Craig Magina (LP: #574476)
    - Dropped: libesd-alsa0 (replaced by libesd0)
    - Bumped:
      + libdirectfb to 1.2-9 from 1.2-0
      + libao2 to libao4
      + odbcinsta1debian1 to odbcinsta1debian2
 -- Stefano Rivera <email address hidden> Mon, 16 Aug 2010 15:36:51 -0000