Comment 2 for bug 488861

Similar issue here - I upgraded from 9.04 to 9.10 a few days ago and my digikam does not work any longer:

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philipp@computer:~$ digikam
digikam: symbol lookup error: /usr/lib/qt4/plugins/phonon_backend/phonon_xine.so: undefined symbol: _ZN9QHashData13detach_helperEPFvPNS_4NodeEPvEPFvS1_Ei

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philipp@computer:~$ which digikam
/usr/local/bin/digikam

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philipp@computer:~$ apt-cache policy digikam
digikam:
  Installiert: 2:1.0.0~beta5-1ubuntu1
  Kandidat: 2:1.0.0~beta5-1ubuntu1
  Versions-Tabelle:
 *** 2:1.0.0~beta5-1ubuntu1 0
        500 http://de.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status

In addition I'll add the same info as the original poster did:

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philipp@computer:~$ gdb digikam
GNU gdb (GDB) 7.0-ubuntu
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/local/bin/digikam...done.
(gdb) run
Starting program: /usr/local/bin/digikam
[Thread debugging using libthread_db enabled]
[New Thread 0x7fffe3914910 (LWP 6080)]
[New Thread 0x7fffe2633910 (LWP 6081)]
[Thread 0x7fffe2633910 (LWP 6081) exited]
[New Thread 0x7fffe2633910 (LWP 6082)]
[New Thread 0x7fffe173e910 (LWP 6083)]
[New Thread 0x7fffe0ebd910 (LWP 6084)]
[New Thread 0x7fffdbfff910 (LWP 6085)]
[New Thread 0x7fffdb7fe910 (LWP 6086)]
[New Thread 0x7fffdaffd910 (LWP 6087)]
[New Thread 0x7fffd5fc6910 (LWP 6088)]
digikam: symbol lookup error: /usr/lib/qt4/plugins/phonon_backend/phonon_xine.so: undefined symbol: _ZN9QHashData13detach_helperEPFvPNS_4NodeEPvEPFvS1_Ei
[Thread 0x7fffd5fc6910 (LWP 6088) exited]
[Thread 0x7fffdaffd910 (LWP 6087) exited]
[Thread 0x7fffdb7fe910 (LWP 6086) exited]
[Thread 0x7fffdbfff910 (LWP 6085) exited]
[Thread 0x7fffe173e910 (LWP 6083) exited]
[Thread 0x7fffe3914910 (LWP 6080) exited]
[Thread 0x7fffe2633910 (LWP 6082) exited]
[Thread 0x7fffe0ebd910 (LWP 6084) exited]

Program exited with code 0177.

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philipp@computer:~$ apt-file search -ix '.*phonon_xine.*'
phonon-backend-xine: /usr/lib/qt4/plugins/phonon_backend/phonon_xine.so
phonon-dbg: /usr/lib/debug/usr/lib/qt4/plugins/phonon_backend/phonon_xine.so

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philipp@computer:~$ apt-cache policy phonon-backend-xine
phonon-backend-xine:
  Installiert: 4:4.3.1-5ubuntu1~ppa1
  Kandidat: 4:4.3.1-5ubuntu1~ppa1
  Versions-Tabelle:
 *** 4:4.3.1-5ubuntu1~ppa1 0
        500 http://ppa.launchpad.net karmic/main Packages
        100 /var/lib/dpkg/status
     4:4.3.1-4ubuntu1 0
        500 http://de.archive.ubuntu.com karmic/main Packages

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philipp@computer:~$ uname -a
Linux computer 2.6.31-15-generic #50-Ubuntu SMP Tue Nov 10 14:53:52 UTC 2009 x86_64 GNU/Linux

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philipp@computer:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 9.10
Release: 9.10
Codename: karmic

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philipp@computer:~$ kde4-config --version
Qt: 4.6.0
KDE: 4.3.2 (KDE 4.3.2)
kde4-config: 1.0

I wonder whether there is no other solution to this problem than the one Gustaw mentions...

Regards,
Philipp