Install On Google Compute Engine Failing

I am trying to install Erpnext on Google Compute Instance . Here is the error I get.

Installing for debian 8 amd64
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Adding debian mariadb repo
Installing packages for debian. This might take time...
Reading package lists...
Building dependency tree...
Reading state information...
libxslt1.1 is already the newest version.
libxslt1.1 set to manually installed.
nginx is already the newest version.
python-setuptools is already the newest version.
python-setuptools set to manually installed.
ntp is already the newest version.
nodejs is already the newest version.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
 **nodejs : Conflicts: npm**
E: Unable to correct problems, you have held broken packages.

I installed npm again same result .
Can you please help me … I am a newbie at system admin stuff .

are you using the smallest system? It could be running out of memory as i’ve had that issue.

Another possible problem could be debian 8, not sure if bench supports that, might want to try debian 7

ERPNext is available as a ready made deployment package with Google IaaS

Could you install it on GCE?