[ubuntu-uk] Where did g++ go?

[Daniel Drummond]

I have just done a fresh install of Jaunty on my netbook, and began my 
usual install of programs I use.  When I came to install g++, I got told:

dan at chainfire:~$ sudo apt-get install g++
Reading package lists... Done
Building dependency tree      
Reading state information... Done
Package g++ 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 g++ has no installation candidate

Anyone know what is happening with g++?

Dan