首次自制安装失败

Question

I've just been introduced to Ruby on Rails and am following instructions to install "homebrew" (using a Mac El Capitan 10.11.3). I tried installing Homebrew by copy pasting the line of installation code from the homebrew website but somehow got an 'failed during' message (this is the first time I tried installation).

I was clueless so I just re-entered the line of code again, here is what comes up (the second time, I get 'file exists' and the 'failed during'):

 ==> Downloading and installing Homebrew...
remote: Counting objects: 54, done.
remote: Compressing objects: 100% (20/20), done.
remote: Total 54 (delta 45), reused 40 (delta 33), pack-reused 0
Unpacking objects: 100% (54/54), done.
error: cannot lock ref 'refs/remotes/origin/master': Unable to 
create '/usr/local/Homebrew/.git/refs/remotes/origin/master.lock':
File exists.

If no other git process is currently running, this probably means a
git process crashed in this repository earlier. Make sure no other git
process is running and remove the file manually to continue.
From https://github.com/Homebrew/brew
! [new branch]      master     -> origin/master  (unable to update
local ref)
Failed during: git fetch origin master:refs/remotes/origin/master --
tags --force --depth=1

I am completely new to development and have no clue how to proceed. Does anyone have any tips?

Answer 1

delete this file

/usr/local/Homebrew/.git/refs/remotes/origin/master.lock

try

rm -f /usr/local/Homebrew/.git/refs/remotes/origin/master.lock

and then try again