Firefox not installing

[kinloch39]

I have been running Kubuntu 12.04 from a usb stick and liked it so much that I installed it to replace my ubuntu 11.10 using the same .iso as on the usb stick. Now i cannot install firefox? It installed ok when running from the usb. The Firefox browser installer runs and says it has installed but it is not there. I have tried from the Muon SW Center and again it runs but is not there. I have used terminal - 'sudo apt-get install firefox' and get a message that the package is missing. What do I need to do? (I am no expert so would appreciate simple please )

[kinloch39]

I found the solution by further searching in the 'help the new guy' forum. By running 'sudo apt-get update' in terminal first I was then able to install firefox. Still not clear why it would install running from the usb but not from the full install but still ...

[luckyone]

I'd suspect that the update was needed because a fresh install has not had an update so it doesn't know what's available in the repositories.