arm cross compiler from Ubuntu apt

For ARM cross compiling, I had been using the Code Sourcery from Mentor Graphics. However the Mentor Graphics ARM compiler became non-free and there are two versions of free gcc compilers default in Ubuntu repository:

• arm-linux-gnueabi-
• arm-none-eabi-

Here are the commands to install them(as of today's Ubuntu Xenial 16.04)

$ sudo apt-get install gcc-arm-linux-gnueabi 
or
$ sudo apt-get install gcc-arm-none-eabi 
or
$ sudo apt-get install gcc-arm-linux-gnueabihf 

Enjoy!