Thanks for filing this bug in Ubuntu.

Could you please share your /etc/samba/smb.conf on that 17.10 server?
The output of "testparm -s" would be best.

I tried the same here and could mount the share just fine from xenial.
Maybe you restricted the smb protocol to higher versions? mount.cifs
will use SMB1 by default, whereas windows 10 will use SMB2 or 3 (can't
recall now).

You can check with "smbstatus" on the server which protocol the connected 
client is using:
root@15-89:~# smbstatus

Samba version 4.5.8-Ubuntu
PID     Username     Group        Machine                                   
Protocol Version  Encryption           Signing              
----------------------------------------------------------------------------------------------------------------------------------------
14179   ubuntu       ubuntu       10.0.5.1 (ipv4:10.0.5.1:57260)            NT1 
              -                    -                    

Service      pid     Machine       Connected at                     Encryption  
 Signing     
---------------------------------------------------------------------------------------------
data         14179   10.0.5.1      Tue Jul 11 12:59:32 PM 2017 UTC  -           
 -           
IPC$         14179   10.0.5.1      Tue Jul 11 12:59:32 PM 2017 UTC  -           
 -           

No locked files

To specify a different version, mount the cifs fileysystem like this:
root@nsn7:~# mount //10.0.5.55/data /data -o user=ubuntu,vers=2.0
Password for ubuntu@//10.0.5.55/data:  ******

root@nsn7:~# cd /data

root@nsn7:/data# ls -l
total 1024
-rwxr-xr-x 1 root root 38 Jul 11 09:57 welcome.txt

root@nsn7:/data# cat welcome.txt 
Welcome to the data share, developer.

root@nsn7:/data# echo bye > bye.txt
root@nsn7:/data# ls -la
total 2052
drwxr-xr-x  2 root root    0 Jul 11 10:02 .
drwxr-xr-x 34 root root 4096 Jul 11 09:59 ..
-rwxr-xr-x  1 root root    4 Jul 11 10:02 bye.txt
-rwxr-xr-x  1 root root   38 Jul 11 09:57 welcome.txt


And smbstatus on the server in this case (showing only the relevant line, for 
brevity):
14182   ubuntu       ubuntu       10.0.5.1 (ipv4:10.0.5.1:57720)            
SMB2_02           -                    -                    

In any case, I can read and write to the share. This is my smb.conf. All 
default except for the removal of printer shares, and the addition of the 
[data] share:
[global]
        server string = %h server (Samba, Ubuntu)
        log file = /var/log/samba/log.%m
        max log size = 1000
        syslog = 0
        panic action = /usr/share/samba/panic-action %d
        usershare allow guests = Yes
        map to guest = Bad User
        obey pam restrictions = Yes
        pam password change = Yes
        passwd chat = *Enter\snew\s*\spassword:* %n\n 
*Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
        passwd program = /usr/bin/passwd %u
        server role = standalone server
        unix password sync = Yes
        dns proxy = No
        idmap config * : backend = tdb

[data]
        comment = Data share
        path = /data
        read only = no
        browseable = true
        guest ok = no


** Changed in: samba (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1703490

Title:
  Unable to mount network volume on 17.10 Samba server

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