Ubuntu – fstab won’t mount SMB/CIFS share in Ubuntu 14.04 (after upgrade from 12.04 LTS)

14.04cifssmbupgrade

I have a NAS network file server which under Ubuntu 12.04LTS I used to automatically mount using the following entry in my fstab file:

//nas-A0-B9-AF/public /opt/Z cifs credentials=/home/user/.smbcredentials,uid=1000,iocharset=utf8 0 0

I upgraded to 14.04 (big mistake) and the share does not mount! Nothing has changed on the server side.
Although I can manually mount the partition by the following command, I no longer have read write access

sudo mount  192.168.1.103:/c/public /opt/Z

I hope someone can help me; this is causing me a great deal of stress and lot of wasted time.

Just one thing: During the upgrade process I opted for my samba configuration to be left as it was under 12.04LTS.

Best Answer

Through an insane number of trial and error experiments and scouring different discussion fora (not forums, fora) I found the following works

//192.168.1.103/public /opt/Z cifs username=,password=,_netdev,uid=1000,iocharset=utf8,sec=ntlm 0 0

I have no idea what sec=ntlm means, but it appears to solve my problem. Could someone please do a post-mortem on this for me? (Neon_overload: Thank you for trying to help anyway.)

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Ubuntu – How to access a password protected share from nautilus

The new nautilus in 13.04 (raring) no longer shows a place to enter connection credentials. This makes it really hard to connect if you don't know the URI syntax. You can find help for the SMB URI syntax at Wikipedia.

Basically, use one of these URIs:

smb://[<user>@]<host>[:<port>][/[<path>]][?<param1>=<value1>[;<param2>=<value2>]] or
smb://[<user>@]<workgroup>[:<port>][/] or
smb://[[<domain>;]<username>[:<password>]@]<server>[:<port>][/[<share>[/[<path>]]][?[<param>=<value>[<param2>=<value2>[...]]]]][5]

The user name can contain spaces explicitly and doesn't require encoding. Myself, I used the following:

smb://My User@WINDOWSHOST/Share

You then are prompted for the credentials. I'm not sure if the share name can have a space since my shares don't have them, so I haven't tested it.

Once you access the share, you can right-click on it in the left panel and Bookmark it. This will make it remap when you log off and back in so you don't have to keep using the Connect to Server method all the time.

Ubuntu – 20.04 upgrade makes NAS unavailble

CIFS is Linux kernel based and knows nothing about smb.conf so making changes there will have no affect on a cifs mount.

I'm going to assume the NAS is running only SMB1 so you will need to specity that in your fstab declaration by adding vers=1.0 to your list of options:

//192.168.1.2/share /mnt/FileServer cifs username=guest,uid=1000,vers=1.0 0 0

You will probably need to add another option to change the defalt security mode that SMB1 had in those days: sec=ntlm So the line becomes:

//192.168.1.2/share /mnt/FileServer cifs username=guest,uid=1000,vers=1.0,sec=ntlm 0 0

EDIT: Reason for adding vers comes from man mount.cifs for the vers option: The default since v4.13.5 is for the client and server to negotiate the highest possible version greater than or equal to 2.1. In kernels prior to v4.13, the default was 1.0. For kernels between v4.13 and v4.13.5 the default is 3.0.

The Linux kernel in Ubuntu 16.04 was accessing the NAS using vers=1.0. Now it's trying to access it between 2.1 and 3. Adding vers=1.0 overrides the default.

Best Answer

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