Error in digitaocean droplet

[ali0818]

I am in Digitalocean ubuntu droplet and I am root user. Getting this error each time when I try to install bitcore-node
Node version = 5.12.0
Npm = 3.8.6

root@Bitcoin:~# npm install -g bitcore-node

npm WARN lifecycle bitcore-node@3.1.3~preinstall: cannot run in wd %s %s (wd=%s) bitcore-node@3.1.3 ./scripts/download /root/.nvm/versions/node/v5.12.0/lib/node_modules/.staging/bitcore-node-d85dd6c0
/root/.nvm/versions/node/v5.12.0/bin/bitcore-node -> /root/.nvm/versions/node/v5.12.0/lib/node_modules/bitcore-node/bin/bitcore-node
npm ERR! Linux 4.4.0-87-generic
npm ERR! argv "/root/.nvm/versions/node/v5.12.0/bin/node" "/root/.nvm/versions/node/v5.12.0/bin/npm" "install" "-g" "bitcore-node"
npm ERR! node v5.12.0
npm ERR! npm v3.8.6
npm ERR! path /root/.nvm/versions/node/v5.12.0/lib/node_modules/bitcore-node/bin/bitcoind
npm ERR! code ENOENT
npm ERR! errno -2
npm ERR! syscall chmod

npm ERR! enoent ENOENT: no such file or directory, chmod '/root/.nvm/versions/node/v5.12.0/lib/node_modules/bitcore-node/bin/bitcoind'
npm ERR! enoent ENOENT: no such file or directory, chmod '/root/.nvm/versions/node/v5.12.0/lib/node_modules/bitcore-node/bin/bitcoind'
npm ERR! enoent This is most likely not a problem with npm itself
npm ERR! enoent and is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! Please include the following file with any support request:
npm ERR! /root/npm-debug.log