im trying to install nvidia drivers , so i went to nvidia website and downloaded the driver. it says i need to type sh NVIDIA-Linux-x86_64-185.18.14-pkg2.run in terminal but when i do it says no such file or directory, now i realize i have to change directory , but i don't know the address where the folder where the driver resides , so i can do cd /blah/blah . I'm confused

, how do i get rid of this file browser ? how do i switch to natilus(ubuntu's file browser) ?