I am currently having ubuntu 11.04
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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.

gcoder
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sudo uname -a
andsudo lsb_release -a
– Saurav Kumar Sep 07 '13 at 10:12