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on the linux box:

install samba:

sudo apt update
sudo apt install samba

edit the config:

sudo nano /etc/samba/smb.conf

#============================ Share Definitions ==============================

[sda1]
   path = /pathtoyourshare/yourdirectorytoshare
   writable = yes
   guest ok = yes
   guest only = yes
   read only = no
   create mode = 0777
   directory mode = 0777
   force user = nobody
  

restart services:

sudo service smbd restart

this is full read/write/execute and no user restrictions. to test, this is fine, so we can rule out permissions issues. once you mount from the windows side and verify everything works, you should go back and edit the samba config to reflect your needs (a specific user share, and maybe 0750 for example).

from the windows box: