I has been using Ubuntu 11 Beta, I want to verify I have the stable version. I read that I should use update manager to update, and read that the was supposed to be an "upgrade platform" or similar button, something I used when I updated from Ubuntu 10.10 to 11 beta. But this time, I dont see that, just normal updates. I tried
cat /etc/issue Ubuntu 11.04 \n \l
Is it the latest?