Newbie Help with Mosquito Install

I have installed mosquito broker on my Ubuntu machine and now have an error, I thought the install had gone well.I have attached a screenshot and wondered if anyone could point me in the right direction, sorry to be vague.

Thank you
Regards
Andrew

Hello fogmajor,

Great to have you. There can be multiple reasons for this.
Check this thread, where a lot has already been discussed.

Does this help?

Thank you