You would rather not do 'upgrade' with update manager, it takes hours and will likely break your system if you have modified it in some non trivial ways (proprietary driver, third party software, ppa, changed system config etc) I would just backup my data and do a clean install, it will take about 20 minutes and even reinstalling all software would probably still be an hour max. A separate /home would be convenient for reinstalling os, so you should make one for the future (or in case you need to reinstall)
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