ubuntu24.04 Claude Codeのインストールに失敗した話

npm install -g @anthropic-ai/claude-code

node.jsインストール後claudecodeをインストールした際下記のエラーが発生。

npm ERR! code EACCES
npm ERR! syscall mkdir
npm ERR! path /usr/local/lib/node_modules
npm ERR! errno -13
npm ERR! Error: EACCES: permission denied, mkdir ‘/usr/local/lib/node_modules’
npm ERR! [Error: EACCES: permission denied, mkdir ‘/usr/local/lib/node_modules’] {
npm ERR! errno: -13,
npm ERR! code: ‘EACCES’,
npm ERR! syscall: ‘mkdir’,
npm ERR! path: ‘/usr/local/lib/node_modules’
npm ERR! }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It is likely you do not have the permissions to access this file as the current user
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator.

npm ERR! A complete log of this run can be found in:
npm ERR! /home/kurumonn/.npm/_logs/2026-01-12T04_55_10_660Z-debug-0.log

解決策は管理者権限で実行していないこと。

管理者権限で実行した場合の結果は下記

:~$ sudo npm install -g @anthropic-ai/claude-code
[sudo] のパスワード:

added 5 packages in 3s

4 packages are looking for funding
run npm fund for details
:~$ claude –version
2.1.5 (Claude Code)