Failed to save 'index.html': Unable to write file 'vscode-remote://wsl+ubuntu-20.04/home/user/website/index.html' (NoPermissions (FileSystemError): Error: EACCES: permission denied, open '/home/user/website/index.html') code example
Example: NoPermissions (FileSystemError): Error: EACCES: permission denied, open '/var/www/html/index.html'
$ sudo chown -R <user-name> <directory-name>