Welcome to Ubuntu.
Echoing others upgrade to 20.04 as soon as possible, when I last checked the 16.04 repositories were still on line. If you wait too much longer they may not be. You will still be able to upgrade but it gets much more complicated.
As noted above check to see if your computer is set to upgrade to LTS versions then do the following:
Open a terminal (Alt Ctrl- T)
At a command prompt:
Code:
$ sudo apt update
$ sudo apt full-upgrade
$ sudo apt autoremove
$ sudo apt autoclean
$ do-release-upgrade
During the upgrade you may be asked a few questions.
Assuming you have a typical desktop installation all of your existing programs and settings should be preserved.
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