I share three or four folders over my network, but since upgrading to 20.04, I am unable to create new ones. When I try, I get the error message

'net usershare' returned error 255: net usershare add: cannot convert name "Everyone" to a SID. > An invalid combination of parameters was specified..

Existing shares continue to be accessible.

I tried the fix given here but the line in question is already in my /etc/samba/smb.conf file.

Edit: Entering net usershare info --long yields the folowing:

[C&L Docs]

path=/home/laurie/Sync/C&L Docs




Entering testparm yields:

Load smb config files from /etc/samba/smb.conf Loaded services file OK. Server role: ROLE_STANDALONE

Press enter to see a dump of your service definitions

Global parameters


client max protocol = NT1

log file = /var/log/samba/log.%m

logging = file

map to guest = Bad User

max log size = 1000

name resolve order = bcast host lmhosts wins

obey pam restrictions = Yes

pam password change = Yes

panic action = /usr/share/samba/panic-action %d

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

server string = %h server (Samba, Ubuntu)

unix password sync = Yes

usershare allow guests = Yes

idmap config * : backend = tdb
  • Please post the output of the following commands: net usershare info --long AND testparm -s
    – Morbius1
    Jul 11, 2020 at 14:10
  • See edited post
    – Lolwhites
    Jul 11, 2020 at 15:03

1 Answer 1


I can reproduce your error. You created a paradox.

client max protocol = NT1

Samba disables NT1 on the server side of your install yet you specify the maximum protocol the client can use to NT1. Ain't gonna happen.

I'm almost certain you meant to add this in smb.conf:

client min protocol = NT1

If I do that and restart smbd: sudo service smbd restart I can create the share without the error message.

  • Thanks, that did the trick!
    – Lolwhites
    Jul 11, 2020 at 17:46

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