I am currently having ubuntu 11.04
1 Answer
As per your statement, if you want to upgrade to next version (12.04 ?) of ubuntu using update manager just type this command in terminal (or hit alt+f2 to run as a program)
$ update-manager -d
It will pop up update manager with the option to upgrade to next version of ubuntu on top.
sudo uname -a
andsudo lsb_release -a