If the CIFS utility is asking you for a Username and Password every time you attempt to mount -a (mount a NAS in Ubuntu) then make sure that you haven't included a period (.) thinking that it is a comma (,).
If you want to mount another disk space in Linux Ubuntu follows instructions below: 1. cd etc/ 2. sudo apt-get install cifs-utils 2. sudo nano fstab 3. Under "/swap.img" type the following: //IPAddressOfYourDisk/FolderName /FolderYouWantToBindTheDiskTo cifs guest,uid=100,iocharset=utf8 0 0 #There is a comma next to "guest" - guest should be replaced with user credentials to log into the Disk Space. 4. sudo mount -a #To finally mount the settings pasted in fstab or sudo mount -av #To see more information about the mount
[NB] If you have followed the code above and you get the error that says "mount: /etc/fstab: parse error at line 6 -- ignored"
Solution: Remove the spaces between guest,uid=100,inocharset=utf8 0 0