Well, this actually is an answer...
I had this problem recently on Ubuntu 14.04 (Trusty) and it got me a little bit irritated, so I'm posting this answer; I saw similar questions but not with these specifics.
If, let's say, you decided to use sharelatex or overleaf for a group project and it was compiling like a charm using biblatex and biber with
\usepackage[backend=biber,...,...]{biblatex}
but suddenly, when you downloaded the .zip and tried to compile it again on Texmaker it "couldn't find \citation \bibdata \bibstyle commands",and you happen to have installed tex-live... AND you're like "oh boy... i guess i'll keep doing it online" (not with these specific words i imagine), this might be for you... (see answer)
biblatex, Biber is the default back-end, so if you want BibTeX (why would you?) you need to request it viabackend=bibtex. Note that sometimes the versions of TeX packages shipped by Ubuntu are a bit outdated, so you might note differences between the output you get on your machine and the online editors. – moewe Feb 20 '16 at 09:29