"laurent@laurent-iMac:~$ smbclient //192.168.1.1/USB1
...
...
protocol negotiation failed: NT_STATUS_CONNECTION_DISCONNECTED"

You are getting a "protocol negotiation failed" error because the server
can only be accessed with SMB1 ( NT1 ) and there is no SMB1 ( NT1 ) in
the version of samba that comes with Ubuntu 20.

A better approach would be a cifs mount where you can dictate the
dialect of smb but for smbclient to connect you need to add "client min
protocol = NT1" and NOT "client max protocol" to your smb.conf - then
restart smbd.

Then smbclient will connect.

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https://bugs.launchpad.net/bugs/1875354

Title:
  No more smb access after migration to UBUNTU 20.04 from UBUNTU 19.10

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