I wanted to make a hotspot and to solve a problem I ran the following command:

sudo apt install firmware-b43-installer

and rebooted the machine to see the effects, but I got a black screen, I can hear the drum sound prompting me to log in. I think the OS boots successfully but with a black screen. My ubuntu was 16.04, after this issue, I took that into recovery mode and upgraded it to 18.04, but the problem's not solved.
I read this thread and some other posts but they didn't help me. Also I set nomodeset in Grub but I couldn't fix the main problem. So, my question is; how can I fix the black screen. I'm not very good at Linux.
Any suggestions are welcome and thank you in advance!

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The issue has fixed using the following page:

How to Fix Display Problems on Ubuntu

Thanks a lot her/him.

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Alen is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct.

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