install samba share on Ubuntu

sudo apt update
sudo apt install samba -y

edit /etc/samba/smb.conf and add:

[name of the share]
   comment = any comment
   path = /lokal_path/to/the/share
   browseable = yes
   read only = no
   guest ok = no

create user and password for samba

must be an existing user and user has to have rights to the share_folder

sudo smbpasswd -a USERNAME

restart samba

sudo systemctl restart samba

then in thunar you can access the share if you put the url like below in the addressbar

smb://192.168.x.x

enter user and password und the created share should appear