Permissions error github (ssh key not recognized)

Question

I seem to have lost my permissions to a github account after pushing to it from another (local) repository. I am now receiving the following error:

git push 
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Answer 1

I solved this problem following this step-by-step instructions:

Step 1: Check for SSH keys

$ cd ~/.ssh
# Checks to see if there is a directory named ".ssh" in your user directory
# If it says "No such file or directory" skip to step 3. Otherwise continue to step 2.

Step 2: Backup and remove existing SSH keys

$ ls
# Lists all the subdirectories in the current directory
# config  id_rsa  id_rsa.pub  known_hosts

$ mkdir key_backup
# Makes a subdirectory called "key_backup" in the current directory

$ cp id_rsa* key_backup
# Copies the id_rsa keypair into key_backup

$ rm id_rsa*
# Deletes the id_rsa keypair

Step 3: Generate a new SSH key

$ ssh-keygen -t rsa -C "your_email@youremail.com"
# Creates a new ssh key using the provided email

# Generating public/private rsa key pair.
# Enter file in which to save the key (/home/you/.ssh/id_rsa):    
# Enter passphrase (empty for no passphrase): [Type a passphrase]
# Enter same passphrase again: [Type passphrase again]    
# Your identification has been saved in /home/you/.ssh/id_rsa.
# Your public key has been saved in /home/you/.ssh/id_rsa.pub.
# The key fingerprint is:
# 01:0f:f4:3b:ca:85:d6:17:a1:7d:f0:68:9d:f0:a2:db your_email@youremail.com

Step 4: Add your SSH key to GitHub

$ sudo apt-get install xclip
# Downloads and installs xclip

$ xclip -sel clip < ~/.ssh/id_rsa.pub
# Copies the contents of the id_rsa.pub file to your clipboard

Then, go to hithub, and do:

1. Go to your Account Settings
2. Click "SSH Keys" in the left sidebar
3. Click "Add SSH key"
4. Paste your key into the "Key" field
5. Click "Add key"
6. Confirm the action by entering your GitHub password

Step 5: Test everything out

$ ssh -T git@github.com
# Attempts to ssh to github

If ok, you'll see

Hi username! You've successfully authenticated, but GitHub does not
# provide shell access.

Otherwise (it happened with me), you will see

Agent admitted failure to sign using the key.
# debug1: No more authentication methods to try.
# Permission denied (publickey).

To solve this

$ ssh-add
# Enter passphrase for /home/you/.ssh/id_rsa: [tippy tap]
# Identity added: /home/you/.ssh/id_rsa (/home/you/.ssh/id_rsa)

For original info

https://help.github.com/articles/generating-ssh-keys

https://help.github.com/articles/error-agent-admitted-failure-to-sign