After hours wasted trying to work with the Ubuntu repository version of
tlmgr wasn't working), I installed the "native" version of
TeXLive (2017, via "Quick Installer" from the official site) and
tlmgr was now functional.
However, when I go ahead and install
TexMaker from the Ubuntu repository, it rolls out its own (outdated) version of
TeXLive. I've been trying to install from binaries on TeXMaker's site, but the site is down.
So then I tried installing
TeXstudio, downloaded the appropriate binary (Ubuntu 16.04 64 bit QT5) and installed it via Software Center, but seemingly I'm getting things I never wanted. E.g. the "native"
tlmgr was in
/usr/local/texlive/2017/bin/x86_64-linux folder, after installing
TeXstudio now it's "shadowed" by
/usr/bin. It's also a version that is 2 years behind the current
tlmgr from the official site.
How to install a TeX editor so that it doesn't roll out its own TexLive installation or