Comment 21 for bug 40561

My USB disk problem is probably unrelated. I am new to Linux and installed Ubuntu 8.04 ( irritatingly called "hardy") on a Dell Inspiron 1100. As soon as it was working, with unreasonable optimism I launched straight into installing Windows XP in a VirtualBox. After considerable blundering it all now works except that....

My external USB hard drive operates fine from the Ubuntu file browser under my personal login but I cannot set its folders to share. The sharing dialog tells me I don't own those folders and have no business trying to share them. It then suggests:
       "Ask the administrator to add the line "usershare owner only = False"
 to the [global] section of the smb.conf to allow this."
I guess that means me, so eventually I found out how to get gksudo priviledges and change the file as suggested. No effect. Checked with gedit that the /usr/share/samba/smb.conf file is indeed changed. With all this priviledge going to my head I even tried commenting out the line: " invalid = root" just in case. Stalemate.

Meanwhile,another USB drive (a 1GB memory stick) works AND shares fine.
Any suggestions?