can't start mongodb on ubuntu - mongodb

Question

I've just installed mongodb on ubuntu using these instructions:
https://askubuntu.com/questions/724749/install-mongo-3-2-on-ubuntu-15-10
When I try to start it, I see this error:
me#devbox:/usr/bin$ service mongod start
Failed to start mongod.service: Unit mongod.service is masked.
me#devbox:~$ mongod
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] MongoDB starting : pid=4343 port=27017 dbpath=/data/db 64-bit host=mydev
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] db version v3.2.5
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] git version: 34e65e5383f7ea1726332cb175b73077ec4a1b02
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.2d 9 Jul 2015
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] allocator: tcmalloc
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] modules: none
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] build environment:
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] distmod: ubuntu1404
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] distarch: x86_64
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] target_arch: x86_64
2016-04-15T11:24:01.941-0400 I CONTROL [initandlisten] options: {}
2016-04-15T11:24:02.031-0400 I STORAGE [initandlisten] exception in initAndListen: 98 Unable to create/open lock file: /data/db/mongod.lock errno:13 Permission denied Is a mongod instance already running?, terminating
2016-04-15T11:24:02.031-0400 I CONTROL [initandlisten] dbexit: rc: 100
When i try to check status, it says this:
me#devbox:~$ service mongod status
● mongod.service
Loaded: masked (/lib/systemd/system/mongod.service; masked; vendor preset: enabled)
Active: inactive (dead)
And when I try to start command line it says this:
me#devbox:/usr/bin$ mongo
MongoDB shell version: 3.2.5
connecting to: test
2016-04-15T11:32:11.828-0400 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
2016-04-15T11:32:11.828-0400 E QUERY [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect#src/mongo/shell/mongo.js:229:14
#(connect):1:6
exception: connect failed
Not sure how to get this started