$ sudo apt-get update
$ sudo apt-get install msp430-libc 

msp430-libc is installed in your system.

Make ensure the msp430-libc package were installed using the commands given below,

$ sudo dpkg-query -l | grep msp430-libc *

You will get with msp430-libc package name, version, architecture and description in a table

msp430-libc package basic information: