Unable to share Public folder after upgrading to 22.04 Mate

What OS are the clients going to be?

I'm not sure what you're asking, I said we upgraded to Ubuntu 22.04 Mate, and just sharing files between computers over the LAN connection. All our computers are running Ubuntu Mate, 2 now upgraded to Ubuntu 22.04 and all others still running Ubuntu 21.10 Mate until we can get 22.04 working.

I'll rephrase. There are systems connecting to the share when you set this up. Are they using Windows or MacOS or are they Linux systems as well?

As I said, all our computers are running Ubuntu Mate Desktop 21.10, except 2 which we just upgraded to Ubuntu 22.04 Mate Desktop, and our sharing between them is done over our in house LAN which also provides us an Internet connection. All sharing is Intranet,

Ahh I see. Then if you install openssh-server on the file server then you can mount sshfs easily. If you swap ssh keys then this will be passwordless.

I just installed "openssh-server" using the Software-boutiqueand I still get the same message when I right click on Public, click Sharing options, and Check Share this folder, folder name Public, and enable both others and guest access, and then click Create Share. 'net-usershare' returned error 255

It's not done through sharing using openssh-server. The server side is now done.

You can run the below on the clients

sudo apt install sshfs

You can now mount sshfs using Nautilus on the client side.

I can see the other computer over the network, but I can't make the Public folder shared in it.
I just added sshfs, and tried to share Public, and still get the same error.

You don't need to share public. The server side is done.

I'll give you the command to mount it if you like. What is the path to "public" on the server side?

And we;re running Ubuntu Mate Desktop version which uses Caja, not Nautilus.
I have not had any problem opening Public in the Ubuntu 21.10 computers from the 22.04 computers.
It's only trying to open Public in the 22.04 computer which I cannot make shared, and get an error each time I try, though I can see print$ over the network but not Public.

Public is the system created folder in my home folder.
We would like to be able to share as in the past, by using the menu, Places, Network, and selecting one of the computers connected to the Network we wish to send files to or retrieve files from.

What is the name of your user?

If you're thinking the smb://computer.local/ ...
That only works if I omit Public, and it shows the computer with print$
If I add Public to the command, it returns an error, No such file or directory and does the same if I try to connect anonymously or login with a password.

That's more a work around than a resolution to the issue.
In the meantime, I've been able to get bluetooth working both directions between al our computers, and can move files that way until we can resolve the issue sharing the Public folder.
But thanks for your help.

You can use something better than Samba if both sides are not Windows

All our computers are running Ubuntu.
The issue is making Public shared without getting an error message,