I have installed the trial version of Mathematica 10.0.2 on Ubuntu 12.04 via the terminal (first time I have done this). The terminal finally displayed "Installation complete" but I cannot see Mathematica on Ubuntu's Unity dash search facility. Please help. Richard
Just to be sure the installation went ok:
Can you see the math and mathematica scripts in /usr/local/bin (or the location you told it to put the scripts in) ?
Can you start them in a terminal window?