Cannot install Cloude Code on different linux machines

What am I doing wrong? I cannot install on Ubuntu or Debian. I run the command like the documentation says but it errors out. Tried to run as root, it installs but then cloude command is not found.

user@ubuntuVM:~$ npm install -g @anthropic-ai/claude-code
npm error code EACCES
npm error syscall mkdir
npm error path /usr/local/lib/node_modules/@anthropic-ai
npm error errno -13
npm error Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/@anthropic-ai'
npm error     at async mkdir (node:internal/fs/promises:857:10)
npm error     at async /usr/local/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/reify.js:624:20
npm error     at async Promise.allSettled (index 0)
npm error     at async [reifyPackages] (/usr/local/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/reify.js:325:11)
npm error     at async Arborist.reify (/usr/local/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/reify.js:142:5)
npm error     at async Install.exec (/usr/local/lib/node_modules/npm/lib/commands/install.js:150:5)
npm error     at async Npm.exec (/usr/local/lib/node_modules/npm/lib/npm.js:207:9)
npm error     at async module.exports (/usr/local/lib/node_modules/npm/lib/cli/entry.js:74:5) {
npm error   errno: -13,
npm error   code: 'EACCES',
npm error   syscall: 'mkdir',
npm error   path: '/usr/local/lib/node_modules/@anthropic-ai'
npm error }
npm error
npm error The operation was rejected by your operating system.
npm error It is likely you do not have the permissions to access this file as the current user
npm error
npm error If you believe this might be a permissions issue, please double-check the
npm error permissions of the file and its containing directories, or try running
npm error the command again as root/Administrator.
npm notice
npm notice New major version of npm available! 10.9.2 -> 11.4.2
npm notice Changelog: https://github.com/npm/cli/releases/tag/v11.4.2
npm notice To update run: npm install -g npm@11.4.2
npm notice
npm error A complete log of this run can be found in: /home/user/.npm/_logs/2025-07-18T13_26_00_443Z-debug-0.log
user@ubuntuVM:~$ node -v
v22.14.0
user@ubuntuVM:~$ npm -v
10.9.2