Hello.
Just in case you wouldn't have found the solution by yourself since then.
I had the same problem today on Ubuntu 12.04 64bits.
The problem is just a 32 / 64bits version problem, about libraries.
A full LDCad 64bits version would be *greatly* appreciated.
To have the 32bits version run on a (ubuntu) 64bits version, you have to install the whole bunch of 32bits lib versions (ubuntu is able to work at the same time with 32/64bits libs now).
sudo apt-get install ia32-libs-gtk
(about 38mo of installed libraries just for LDCad on my side ......)
After that it works.
Just in case you wouldn't have found the solution by yourself since then.
I had the same problem today on Ubuntu 12.04 64bits.
The problem is just a 32 / 64bits version problem, about libraries.
A full LDCad 64bits version would be *greatly* appreciated.
To have the 32bits version run on a (ubuntu) 64bits version, you have to install the whole bunch of 32bits lib versions (ubuntu is able to work at the same time with 32/64bits libs now).
sudo apt-get install ia32-libs-gtk
(about 38mo of installed libraries just for LDCad on my side ......)
After that it works.