Hello so i'm using Gnome ubuntu 16.04 LTS, and i want to

>>334609
Two primary steps
>updates are coming in every two weeks in average. Install them.
>don't tell anyone your password(s, if you have encrypted the hard drive)

Then the obvious, don't work as a root but as a user.

Further advices consider permissions you give to other users as a root if there are more people using your computer. Those are essentially all about what you want to show to others, are others allowed to boot from a USB/DVD (hopefully not), who can have remote access, who can print, save, modify files etc. Basic stuff done with the terminal interface as a superuser.

by updating to the latest version, because 17.04 has been out for a while, and it's been getting alot of updates

>>334609
Turn the firewall (ufw) on and download updates regularly.

>>334609
>>334709
You'll be using systemd and pulse audio regardless, so no matter what, you won't have a secure system.

Not memeing, install gentoo/funtoo/slackware. THEN you can start thinking security. But once you have no factory backdoors, just install a good ad blocker (uBlock Origin is good enough. uMatrix too), don't install just any browser addon, turn on your firewall, and don't play on superuser if you don't clearly know what you're doing. Use HTTPS-Everywhere too if you use sites not usually covered by HSTS, so you can add your https rules.

>>334788
did you build your own cpu as well? If not, I've got some bad news for you

>>334793
Still using i5.

>>334609
One of the problems windows always had was people logging into the admin account and not changing anything. Never using the guest account for basic browsing. Then only using the other accounts to install things and alter files.