Update 'INSTALL.md'

INSTALL.md

@@ -44,10 +44,10 @@ cd hush3
 
 ## Building On Ubuntu 16.04 and older systems
 
-Some older compilers may not be able to compile modern code, such as gcc 5.4 which comes with Ubuntu 16.04 by default. Here is how to install gcc 7 on Ubuntu 16.04:
+Some older compilers may not be able to compile modern code, such as gcc 5.4 which comes with Ubuntu 16.04 by default. Here is how to install gcc 7 on Ubuntu 16.04. Run these commands as root:
 
 ```
-sudo add-apt-repository ppa:ubuntu-toolchain-r/test && \
+add-apt-repository ppa:ubuntu-toolchain-r/test && \
 apt update && \
 apt-get install -y gcc-7 g++-7 && \
   update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-7 60 && \