Kubuntu 7.04 not updating correctly
Hi, I'm new around these parts and fairly new to linux.
I have a laptop (Intel core 2, T5500 1.66GHz, 1GB of RAM) which first had Vista and Kubuntu on two partitions. They both worked fine, with no problems. Then I got bored of not being able to play games on vista so I installed XP and had to reinstall Kubuntu. At this time I moved to Uni and had to use their network. The problem was I couldn't update or install programs with apt-get. I thought it might be something to do with the network, I connect using proxy configuration URL. I can browse the web fine.
This is the message I got when I tried to get firefox
ror@ror-laptop:~$ sudo apt-get install firefox
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package firefox is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package firefox has no installation candidate
When I look at apt-install, most of the items are greyed out and unclickable. Can anybody help me please? This is what it's like when I install without me doing or changing anything.