Installation problems (Ubuntu 14.04)

[M.Bona]

Completely solved!
I had to follow these instructions to config and make root:

[quote=“Wile E. Coyote”]

Missing Canvas

Honestly speaking, sooner or later, you will learn by hard that the policy of using a “system-provided” ROOT version (e.g. in “/usr/[bin|lib]” or “/usr/local/[bin|lib]”) is a dead end. You will learn that you need something like three different versions of ROOT - just because something that works with a particular ROOT version is not working with another ones, or because some piece of your additional, experiment / analysis specific, software explicitly requires a particular ROOT version. The s…

https://root-forum.cern.ch/t/trouble-installing/18046/11[/quote]
Then, to avoid the .bin/thisroot.sh problem after any reboot (or new session) I followed what has been said here: ROOT uninstalls on reboot - #6 by Wile_E_Coyote
(It was sufficient to add source /(this first slash is foundamental)FULL/PATH/TO/YOUR/ROOT/bin/thisroot.sh to my .bashrc)

Thank you Wile E. Coyote, your help was really appreciated!