【Git】git clone コマンドで「fatal: Could not read from remote repository.」が表示された場合の対処方法

[test@SAKURA_VPS ~]$ git clone git@github.com:neologd/mecab-ipadic-neologd.git
Cloning into ‘mecab-ipadic-neologd’…
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
[test@SAKURA_VPS ~]$

[test@SAKURA_VPS ~]$ ssh-keygen -C “git@github.com” -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/test/.ssh/id_rsa): /home/test/.ssh/id_rsa_git　←　任意のディレクトとファイル名で鍵を作成します。（既存の鍵を上書きで壊さないように注意します）
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/test/.ssh/id_rsa_git.
Your public key has been saved in /home/test/.ssh/id_rsa_git.pub.
The key fingerprint is:
SHA256:lHG7DMrNugxxxxxxxxxxxxxxxxxxxxKlWeSsY git@github.com
The key’s randomart image is:
+—[RSA 2048]—-+
|        . .   +**|
|         + . ..++|
|        +.. = =+.|
|     . = o++ E +.|
|      o Soo++.o .|
|       .* +..o. .|
|    o .o B  .  . |
|   . + .+ .      |
|    . +o .       |
+—-[SHA256]—–+
[test@SAKURA_VPS ~]$

[test@SAKURA_VPS ~]$ eval `ssh-agent`
Agent pid 12647

[test@SAKURA_VPS ~]$ ssh-add /home/test/.ssh/id_rsa_git
Identity added: /home/test/.ssh/id_rsa_git (/home/test/.ssh/id_rsa_git)
[test@SAKURA_VPS ~]$

[test@SAKURA_VPS .ssh]$ ls
authorized_keys 　id_rsa　 id_rsa.pub　 id_rsa_git　 id_rsa_git.pub　 known_hosts
[test@SAKURA_VPS .ssh]$

[test@SAKURA_VPS .ssh]$ cat id_rsa_git.pub
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxRPURnREFcNVNRhGHA318fhsq9Sm5+U7fHjWQh+JB2fysQwDhDO49/UIEU0W7uQJ4NWzAM55ePpEld292/iIR8EpyePzWz6tZ4mvaUti5scO9VkNR70qhSNulUhPQ4+YxhK5kudcQSaoWSFkamPM3 git@github.com
[test@SAKURA_VPS .ssh]$

[test@SAKURA_VPS ~]$ git clone git@github.com:neologd/mecab-ipadic-neologd.git
Cloning into ‘mecab-ipadic-neologd’…
remote: Counting objects: 5478, done.
remote: Compressing objects: 100% (12/12), done.
remote: Total 5478 (delta 8), reused 13 (delta 6), pack-reused 5460
Receiving objects: 100% (5478/5478), 296.43 MiB | 7.85 MiB/s, done.
Resolving deltas: 100% (3300/3300), done.
[test@SAKURA_VPS ~]$