Install software from trusted sources
On Linux, where your software comes from is the single biggest thing that keeps you safe. Software from your distribution's official repositories is checked and signed. Software pasted from a random website is not, and that's how most Linux malware gets in.
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Stick to trusted sources
A few simple rules cover it.
3 steps
Tidy up what you've added
Over time it's easy to add extra software sources (called repositories or PPAs) and forget them. Each one you keep is something you're trusting. On Ubuntu, review them under Software & Updates, in the Other Software tab, and remove any you no longer use.
The simple rule
If you're not sure where a piece of software comes from, don't install it. There's almost always a trusted version in your distribution's own repositories.
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