Ghost: Unable to Update Ghost to v0.8.0 on production server

Hello, I have a live blog and I’m unable to update my ghost blog as per the docs.

I tried several combinations of following :

1. deleting entire core, node_modules and index.js file and replacing it with new ones
2. using npm cache clean
3. changing and updating to root level and using the commands as a root user.
4. changing node version.

But none of them work.

While using 0.12.0, I get following error while installing node

> npm install semver && node -e "require('./core/server/utils/startup-check.js').nodeVersion()"

semver@5.1.0 node_modules/semver

> jsonpath@0.2.2 postinstall /var/www/ghost/node_modules/jsonpath
> node lib/aesprim.js > generated/aesprim-browser.js

Killed

What does Killed mean?

This is what is shown when I type npm start --production

>ghost@0.8.0 start /var/www/ghost
> node index

module.js:338
    throw err;
          ^
Error: Cannot find module 'xmlbuilder'
    at Function.Module._resolveFilename (module.js:336:15)
    at Function.Module._load (module.js:278:25)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (/var/www/ghost/node_modules/nodemailer/node_modules/aws-sdk/lib/xml/builder.js:2:15)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (/var/www/ghost/node_modules/nodemailer/node_modules/aws-sdk/lib/core.js:42:14)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)

npm ERR! Linux 3.13.0-57-generic
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "start" "--production"
npm ERR! node v0.12.0
npm ERR! npm  v2.5.1
npm ERR! code ELIFECYCLE
npm ERR! ghost@0.8.0 start: `node index`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the ghost@0.8.0 start script 'node index'.
npm ERR! This is most likely a problem with the ghost package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node index
npm ERR! You can get their info via:
npm ERR!     npm owner ls ghost
npm ERR! There is likely additional logging output above.

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

And these are contents of /var/www/ghost/npm-debug.log

0 info it worked if it ends with ok
1 verbose cli [ '/usr/local/bin/node',
1 verbose cli   '/usr/local/bin/npm',
1 verbose cli   'start',
1 verbose cli   '--production' ]
2 info using npm@1.2.14
3 info using node@v0.10.0
4 verbose read json /var/www/package.json
5 error Error: ENOENT, open '/var/www/package.json'
6 error If you need help, you may report this log at:
6 error     <http://github.com/isaacs/npm/issues>
6 error or email it to:
6 error     <npm-@googlegroups.com>
7 error System Linux 3.13.0-57-generic
8 error command "/usr/local/bin/node" "/usr/local/bin/npm" "start" "--production"
9 error cwd /var/www
10 error node -v v0.10.0
11 error npm -v 1.2.14
12 error path /var/www/package.json
13 error code ENOENT
14 error errno 34
15 verbose exit [ 34, true ]

Update: I get the same issue while installing 0.9.0-beta.2

> ghost@0.9.0-beta.2 preinstall /var/www/ghost
> npm install semver && node -e "require('./core/server/utils/startup-check.js').nodeVersion()"

semver@5.1.0 node_modules/semver
Killed

Thanks