Garry's Mod server can't even start up! *IMMEDIATE HELP NEEDED*

[RizonRise]

Hello,

So I've spent the last 4 and a half hours trying to fix this issue...Nothing, and i mean NOTHING, could help it a single bit.

I've spent hours researching the issue too, and still nothing.

Some notes before I move on:
-This is a VPS (Virtual private server)
-I'm using Ubuntu.
-I am frustrated so please bare with me.

Apparently, I also get the "VAC mode is secure" message BEFORE the addons mount, which is weird because it is usually after..

Anyways, here is my issue:
[B]Network: IP 107.161.169.xxx, mode MP, dedicated Yes, ports 27015 SV / 27005 CL[/B] (IP Hidden for security purposes)

Currently that is the only piece of information I can give you, as literally NOTHING on the internet has helped.
Before, my ports were 27015, then when I came home today after school, they suddenly turned to 27016. I reverted it back to 27015 somehow, and I can't see the server anywhere.
There is nothing after this line, as it just stops when this comes on.

This is my startup command:
[B]screen sudo ./srcds_run -game garrysmod +hostname SUHDUDE +maxplayers 8 +hostname +map rp_venator_v3 +gamemode starwarsrp +host_workshop_collection 885520404 -authkey XXX +ip 107.161.169.xxx +port 27015[/B] (Authkey and IP hidden for security)

I would literally be the happiest kid on planet earth if I get a successful answer..
You don't know how long I've been waiting for an answer..legit.

[Danneh]

Can you connect to the server via the console? Is the port 27015 definitely unblocked for the server?

[InvalidVertex]

First off, remove sudo from the command line. You should never run a game server (especially a Source Engine game server) with elevated privileges.

Second, try this (don't forget to re-add your authkey and IP):
screen -dmS gmod ./srcds_run -game garrysmod +hostname SUHDUDE +maxplayers 8 +map rp_venator_v3 +gamemode starwarsrp +host_workshop_collection 885520404 -authkey XXX +ip 107.161.169.xxx +port 27015