I have installed mongodb in my Ubuntu 10.04.
I know that when it comes to start the mongodb server with the command \"mongod\",then it expects /data/db
sudo find / -name "mongodb.log" -type f
result: /var/log/mongodb/mongodb.log
open /var/log/mongodb/mongodb.log
search for last "exception" word
try to correct exception
In my case exception was the next: 2015-07-30T15:09:15.806+0300 [initandlisten] exception in initAndListen: 13597 can't start without --journal enabled when journal/ files are present, terminating
I made the next: