Just took the plunge and upgraded from 16.04 to 20.04 and has a bunch of issues getting my NAS drive to mount at all (fixed by changing the sex from ntml to ntmlssp) and I can access it now but only have read permissions.

It's a synology NAS and the user I'm logging in as has read/write permissions to the share which were working previously in 16.04 and have tested on a windows machine and mac.

I'm fairly basic with my linux knowledge so let me know if you need anything else. Current fstab is

// /media/windowsshare cifs username=myusername,password=mypassword,vers=3.0,iocharset=utf8,sec=ntmlssp 0 0

As previously stated this was working in 16.04 and since then the only change I made was to change the sec from ntml to ntmlssp.


1 Answer 1


// /media/windowsshare cifs username=myusername,password=mypassword,vers=3.0,iocharset=utf8,sec=ntmlssp 0 0

I betcha it is writeable but not to you only to root. You need to take possession of the mounted share in Ubuntu by adding uid=myusername to the list of options:

// /media/windowsshare cifs username=myusername,password=mypassword,uid=myusername,vers=3.0,iocharset=utf8,sec=ntmlssp 0 0
  • You are 100% correct! Thank you so much, I can stop banging my head against the wall now! Now to go off and learn more about uid to avoid similar mistakes in future... Commented Oct 28, 2020 at 20:19

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