mediascanner2.0 uses 100% CPU every 30 seconds

Unless you're actively using an app that uses mediascanner2, it might be best to just remove the package. This package was developed for the Ubuntu Phone project, which is no longer based on Trusty.

The latest version almost certainly improves matters (it better protects against crashes caused by the codecs), but I don't know whether we'll be back porting it to 14.04 (all current development is targeting Xenial and Vivid).

I removed the package and noticed no problem.

BUT why did a package developed for the Ubuntu Phone appear on my workstation?

If the goal is convergence between phone and desktop, I think that it would be wiser to make desktop applications work on the phone rather porting phone applications to the desktop.

Example : on my desktop, I use VLC for multimedia and on the phone you have 2 applications that does not work as well (one for videos and one for music)... And even if I install VLC on the phone, it does not appear in the applications and can't be launched from terminal (display problem)