No write access to samba share

Question

Scenario

• Kubuntu desktop 18.04, tower
• Lubuntu desktop 18.04, laptop
• Windows 10, laptop

Kubuntu

• I installed and configured samba server as per Install and Configure Samba in Ubuntu 18.04 Bionic Beaver
• My addition to /etc/smb.conf:

[kubuntu_home]
   path = /home/myusername
   available = yes
   valid users = myusername
   read only = no
   browseable = yes
   public = yes
   writable = yes

• I thought that there was a typo on the website, but when I checked it out on samba.org, I found that writable is a synonym for writeable.

Lubuntu

• I mounted the samba share as per How to Mount Samba Share in Ubuntu Linux

$ sudo mount -t cifs -o username=myusername,password=mypassword //192.168.###.###/kubuntu_home /mnt/kubuntu_home

Windows

• I mounted the samba share as per How to connect to Linux Samba shares from Windows 10

Problem

From Lubuntu, I can read files but cannot write.

• From Kubuntu, ls -l ~ shows files and directories as belonging to myusername myusername.
• From Lubuntu, ls -l /mnt/kubuntu_home/ displays all files and folders as belonging to root root.
• Somewhere along the way, I saw a suggestion to add force user = myusername to smb.conf. This did not make a difference.
• No problems reading/writing from Windows.

Answer 1

Take possession of the mounted share so that it's owned by you not root.

Change this:

$ sudo mount -t cifs -o username=myusername,password=mypassword //192.168.###.###/kubuntu_home /mnt/kubuntu_home

To this:

$ sudo mount -t cifs -o username=myusername,password=mypassword,uid=1000 //192.168.###.###/kubuntu_home /mnt/kubuntu_home

By adding uid=1000 to the list of options.

Note: Your uid number on the Lubuntu machine may not be 1000. To verify that number run id in a terminal and change the mount command if necessary.