How to specify where CMake is installed in Ubuntu?

Question

I have downloaded the cmake-3.11.3-Linux-x86_64.sh file. Then I executed it and it created a folder that has a bin file there is cmake

Answer 1

Rather than installing CMake mannually,
Please let apt take care of it.

Just rollback whatever changes you've done.
Simply type sudo apt install cmake on your terminal.

and you're ready to use CMake since apt takes care of all dependencies installations and environment variable settings.

I hope, this will help.