[This message was posted in qtcentre.org forum, but have not received any reply. Please excuse my cross-posting, but I'm getting desperate.]
I successfully installed and can run Qt4 Designer on my desktop machine, which is a 64-bit system running Ubuntu 12.04 LTS. Now I am trying to install Qt4 Designer on a laptop that is running 64-bit Ubuntu 14.04 LTS. Updates are regularly installed.
However, when I install Qt4 Designer on the laptop (using the Ubuntu Software Center) and click on the icon in the launcher, the application simply does not start. I suspect that there is a library missing or an incompatible one installed on the laptop, and I've tried to compare what I have installed on the desktop and laptop to see whether there is any difference, but so far I have not been able to find what the problem is.
Does anyone know of any obvious missing libraries, incompatibilities, conflicts, wrong versions, etc., that could be responsible for this?
Thanks in advance for any suggestions.
Tom

You can try starting Qt4 Designer from a console and check the error messages you see there (assuming it still doesn't start). That may give you a clue about what you're missing.
jdk

1 members found this post helpful.

Hello jdkaye,
Thanks for your suggestion. I tried that and got the following:

tom@Napoleon:~$ which designer-qt4
/usr/bin/designer-qt4
tom@Napoleon:~$ designer-qt4 &
[1] 10427
tom@Napoleon:~$ makekdewidgets(10427)/libakonadi Akonadi::AgentManagerPrivate::createDBusInterface: AgentManager failed to get a valid AgentManager DBus interface. Error is: 1 "org.freedesktop.DBus.Error.NameHasNoOwner" "Could not get owner of name 'org.freedesktop.Akonadi.Control': no such name"
designer-qt4: symbol lookup error: /usr/lib/x86_64-linux-gnu/qt4/plugins/designer/libqscintillaplugin.so: undefined symbol: _ZN13QsciScintillaC1EP7QWidget

[1]+ Exit 127 designer-qt4
tom@Napoleon:~$

None of the messages mean anything to me. Thanks in advance for any suggestions. I'm getting desperate.
Tom

Success!
I searched for the strings "undefined symbol:" _ZN13QsciScintillaC1EP7QWidget
and found this bug report:
https://bugs.archlinux.org/task/39716
Conclusion of the bug was:
"So it seems the qscintilla package may need re-building after the qt4-4.8.5-8 release."
I checked computer that was having the problem, and it had the qscintilla package installed.
I simply uninstalled everything related to it, and then Qt4 Designer launched normally.
Thanks to everyone who made suggestions.
Tom

Glad to hear you solved it. As a service to others please mark this thread as [SOLVED]. You can use the Thread Tools just above your first post of this thread.
jdk