Can you post the exact error message? Is there any log file generated by "ids_install"?
root@ghanshyam-VirtualBox:/mnt/informix/product# ./ids_install Preparing to install... Extracting the JRE from the installer archive... Unpacking the JRE... Extracting the installation resources from the installer archive... Configuring the installer for this system's environment... Launching installer... JRE libraries are missing or not compatible.... Exiting.... root@ghanshyam-VirtualBox:/mnt/informix/product#
And what version of Ubuntu are you using? And what version of the Informix installer are you using? One possibility is that you are trying to install the 32 bit version on a 64 bit OS. Or maybe there is not enough space on /tmp to unpack the installation files. You can change the directory used for unpacking by exporting the variable IATEMPDIR .