Need linux help

Ubuntu is debian, so it should use "apt-get install ..." for command line and "synaptic" for a gui. If it's debian and it doesn't have synaptic then "sudu apt-get install synaptic" would take care of it. If it has KDE then "kpackage" works with whatever system it's on, but I remember you said you were using Gnome and I don't know (but it probably has) the package manager for Gnome.