Help me fix my compiler

[Namal via Digitalmars-d-learn]

Hello,

I used the Install Script command line to install the newest dmd 
compiler (Ubuntu 16.04.2 LTS). Now I have to type 'source 
~/dlang/dmd-2.074.1/activate' before I can use it and it is also 
not show in the software center like it used to be. How can I fix 
it or how can I remove it?

Thx