i install nodebb,but i can not find any info about the admin account

i can not login with the admin,have anybody tell me ?

root@ubuntu:/opt/nodebb/nodebb# apt-get install git nodejs redis-server npm build-essential imagemagick
Reading package lists... Done
Building dependency tree
Reading state information... Done
git 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