Upgrade to 14.04 now can't mount Windows share
 

I have an Ubuntu desktop in an Active Directory network. I ran 10.04 for several years, then recently upgraded to 14.04. I mount several Windows shares for daily use of various files. The "public" shares (general shares used by multiple users) mount with no problem. However, when I try to mount my personal My Documents share, I get a Permission Denied error. I can go back to my 10.04 installation and it mounts just fine. When I boot in 14.04 I get a permission denied error. The fstab entries are the same.

What has changed from 10.04 to 14.04 that would cause this problem? I have verified credentials and all are proper. If I put phony credentials in, the public shares give me a permission denied error also, so I know the system is reading them correctly.

Here is pertinent parts of my fstab file.

Any ideas would be appreciated.

I've probably run into similar problem after installing 14.04, and managed to fix it, but I don't remember exactly how.

Just a wild guess: try editing your credentials file (/home/mbarnes/.me), so it:

* does not contain any spaces around "="

* ends with a newline

It seems to me that the credential file parser in SMB client became stricter (dumber?) in 14.04. (Trusty Tahr also introduced Samba 4, is it a coincidence?)

Try this, may help:
 

Had a problem like this one before. I have an Ubuntu 12 and OpenSUSE 13 multiboot install.
On one system I could not specifiy the user as "user@domain" (or similar) but had to use une line in the credentials file for the user name and another for the domain. In both cases the files were not allowed to be readable by anyone else than root. So I put them in /root.
I think I put uid to root but set gid to users.
My 0.02.

I have a single element per line cred file plus a newline at the end as follows:

With this, I get a "Credential formatted incorrectly: (null)" error.

I take out the newline at the end and I get the same response, without the format error.

I can mount the public shares with no problem. Again, this problem exists in 14.04. I can boot into 10.3 and it mounts fine. I sure would like to get this fixed.

The problem is, mount.cifs almost always reports a permission error. So that error message really is more confusing than helpful. (I have no idea why they programmed it like that.)
The line mount.cifs outputs doesn't match your fstab entry you posted earlier. I suppose you changed the name of the "My Documents" folder to rule out any problem with the space.
Can you mount when giving all the needed options via command line? (I think you need the -o parameter and a comma-separated list of options like "user=...,password=...".) That way you might be able to confirm it works at all. Nautilus (as you're on Ubuntu) should be able to take an address like "smb://server/share" after you pressed [CTRL]-L and then ask for username, domain and password, and then show the share. Have you tried?

Can you also try to remove sec=ntlm from the fstab entry? I guess it will let Samba detect the security mode automatically.

I guess mount.cifs have splitted the server path into share UNC (unc=\\DAL-S-ADC-12\SRN_MyDocuments) and prefix path (prefixpath=michael.barnes/My Documents), so the fstab line did not change.

I tried several permutations of the sec option, including ntlmv, ntlmv2, ntlmssp, etc. as well as without the entry at all with no results.

It does not work via the command line, either. I also tried in nautilus using the suggested format and got this:

Again, this is something that changed between 10.3 and 14.04. When I boot to 10.3, the share mounts with no problem. When I boot to 14.04, it won't mount.

Thanks for any help.