Binary not found

Hello,

today I reinstalled Linux going over from Debian Testing with messed up partitions to Ubuntu with LVM. I was quite happy to see that SL worked better than before at first, especially after I figured out that I had to install the "esound" package to make sound work properly.

However, suddenly my systems starts to refuse running the binary.

sharven@schatten:~/Desktop/SecondLife_i686_1_18_6_76116_WINDLIGHT$ ./secondlife 
Warning: Did not register secondlife:// handler with KDE: Directory /home/sharven/.kde/share/services does not exist.
./secondlife: line 93: bin/do-not-directly-run-secondlife-bin: No such file or directory
...
-rwxrwxr-x 1 sharven sharven 42383612 2007-12-19 18:44 bin/do-not-directly-run-secondlife-bin

That was from a reinstalled pacakge after the original one started the same. I worked one moment, and the other it did not. As though the executable wasn't an executeable at all, since the file obviously does exist.

Might have something to do with my system being a 64bit one, but why did it work before then? I did install some applications in the meantime: vlc, mozilla-plugin-vlc, gnash and mozilla-plugin-gnash. I uninstall all of them again including the prerequisits.

I also had a different SL client, from ByteME installed. However, since that isn't a windlight and makes much more trouble with the sound than the original one I uninstalled it again and then installed it again, to find out wether one library it depends on makes the difference. Nothing.

Has anyone a clue why a system would suddenly stop running an executable it did execute before?

I've got it. Though now I have absolutely no clue why it did work before.

I had to install the package ia32-libs. That's a quite obvious one so sorry for bothering you. But I still can not explain this to me. If the package was missing all the time why did it run at first and then suddenly not? I did not uninstall such a package!