Yes, I have installed the recommended pack. Also, from the terminal it does allow me to start sagemath, but the problem is that from the application I can't start sagemath from a folder, as I did before.
Recently, I have install Ubuntu 64amd making duak boot with Windows 7 32bit. Everything is ok ,but I'm unable to install sagemath in it. it says " unable to locate the package sagemath-upstream-binary" even when the code is correct. may I know why?