20.04 upgrade makes NAS unavailble

I have been running 16.04 for four years and opted to upgrade to 20.04.

I have two Buffalo Linkstation NAS devices that I've been using for years without too much difficulty. However after this upgrade, the network shares are completely unavailable to me.

I've tried the suggestions in, e.g., Can't acces NAS anymore after upgrading to 20.04 and had no luck. So far, this is my course of action:

1. Perform a clean install (not an upgrade) of Windows 10 on the box.
2. Perform a clean install (not an upgrade) of Ubuntu 20.04, creating a dual-boot system.
3. Update /etc/fstab with the following, copied and pasted from the fstab file in my 16.04 environment:

   //192.168.1.2/share /mnt/FileServer cifs username=guest,uid=1000 0 0

4. Install Samba: sudo apt-get install samba
5. Update smb.conf file with client min protocol = NT1
6. Restart samba: sudo service smbd restart
7. sudo mount -a

I get this error:

mount: /media/FileServer: special device //192.168.1.2/share does not exist.

I have also tried setting the minimum protocol to CORE with no luck.I cannot find any way to affect the samba version on my Buffalo Linkstation NAS devices. Can someone please suggest something else to try?

Thanks!