Cannot install redoc-cli globally

[jooola]

I cannot install the redoc-cli tool without hitting a permission error, even when installing as root.

I don't know if this is specially related to redoc-cli but I can install other packages globally without any problem.

Here is what I tried to achieve (using root user or sudo gives the same result):

root@jofix:~# npm install -g redoc-cli --verbose
npm info it worked if it ends with ok
npm verb cli [ '/usr/bin/node',
npm verb cli   '/usr/bin/npm',
npm verb cli   'install',
npm verb cli   '-g',
npm verb cli   'redoc-cli',
npm verb cli   '--verbose' ]
npm info using [email protected]
npm info using [email protected]
npm verb npm-session f45ebafef4f7b78f
npm http fetch GET 304 https://registry.npmjs.org/redoc-cli 150ms (from cache)
npm timing stage:loadCurrentTree Completed in 288ms
npm timing stage:loadIdealTree:cloneCurrentTree Completed in 0ms
npm timing stage:loadIdealTree:loadShrinkwrap Completed in 2ms

[...]

npm http fetch GET 304 https://registry.npmjs.org/memoize-one 174ms (from cache)
npm timing stage:rollbackFailedOptional Completed in 0ms
npm timing stage:runTopLevelLifecycles Completed in 3332ms
npm verb stack Error: exited with error code: 128
npm verb stack     at ChildProcess.<anonymous> (/usr/lib/node_modules/npm/node_modules/pacote/lib/util/finished.js:12:19)
npm verb stack     at ChildProcess.emit (events.js:182:13)
npm verb stack     at maybeClose (internal/child_process.js:962:16)
npm verb stack     at Socket.stream.socket.on (internal/child_process.js:381:11)
npm verb stack     at Socket.emit (events.js:182:13)
npm verb stack     at Pipe._handle.close (net.js:610:12)
npm verb cwd /root
npm verb Linux 4.9.0-8-amd64
npm verb argv "/usr/bin/node" "/usr/bin/npm" "install" "-g" "redoc-cli" "--verbose"
npm verb node v10.15.0
npm verb npm  v6.4.1
npm ERR! Error while executing:
npm ERR! /usr/bin/git ls-remote -h -t https://github.com/markedjs/marked.git
npm ERR! 
npm ERR! fatal: failed to stat '.': Permission denied
npm ERR! 
npm ERR! exited with error code: 128
npm verb exit [ 1, true ]
npm timing npm Completed in 3998ms

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2019-01-01T20_22_17_353Z-debug.log
root@jofix:~# 

Or

jo@jofix:~$ sudo npm install -g --verbose redoc-cli
npm info it worked if it ends with ok
npm verb cli [ '/usr/bin/node',
npm verb cli   '/usr/bin/npm',
npm verb cli   'install',
npm verb cli   '-g',
npm verb cli   '--verbose',
npm verb cli   'redoc-cli' ]
npm info using [email protected]
npm info using [email protected]
npm verb npm-session 96cbd68f088636de
npm http fetch GET 304 https://registry.npmjs.org/redoc-cli 175ms (from cache)
npm timing stage:loadCurrentTree Completed in 319ms
npm timing stage:loadIdealTree:cloneCurrentTree Completed in 0ms

[...]

npm http fetch GET 304 https://registry.npmjs.org/stickyfill 70ms (from cache)
npm timing stage:rollbackFailedOptional Completed in 0ms
npm timing stage:runTopLevelLifecycles Completed in 9468ms
npm verb stack Error: Command failed: /usr/bin/git submodule update -q --init --recursive
npm verb stack fatal: Could not change back to '/root/.npm/_cacache/tmp/git-clone-7f37944e': Permission denied
npm verb stack 
npm verb stack     at ChildProcess.exithandler (child_process.js:294:12)
npm verb stack     at ChildProcess.emit (events.js:182:13)
npm verb stack     at maybeClose (internal/child_process.js:962:16)
npm verb stack     at Socket.stream.socket.on (internal/child_process.js:381:11)
npm verb stack     at Socket.emit (events.js:182:13)
npm verb stack     at Pipe._handle.close (net.js:610:12)
npm verb cwd /home/jo/go/src/gitlab.com/vtrack/vtrack-server
npm verb Linux 4.9.0-8-amd64
npm verb argv "/usr/bin/node" "/usr/bin/npm" "install" "-g" "--verbose" "redoc-cli"
npm verb node v10.15.0
npm verb npm  v6.4.1
npm ERR! code 128
npm ERR! Command failed: /usr/bin/git submodule update -q --init --recursive
npm ERR! fatal: Could not change back to '/root/.npm/_cacache/tmp/git-clone-7f37944e': Permission denied
npm ERR! 
npm verb exit [ 1, true ]
npm timing npm Completed in 9872ms

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2019-01-01T20_28_36_872Z-debug.log

[jooola]

This has something to do with npm permissions again, sorry to bother here.