Comment 6 for bug 1764853

/etc/netplan/ contains 01-network-manager-all.yaml, if I remove it I get no network connection.
This systems seems to be already migrated to netplan.

/etc/network/interfaces.d/ is empty, /etc/network/interfaces contains only the default lo interface.

smb.conf:
[global]
        workgroup = JDW
        realm = JDW.CONET
        security = ads
        idmap config * : backend = tdb
        idmap config * : range = 1000000-1999999
        idmap config JDW : backend = rid
        idmap config JDW : range = 1266900000-2000000000
        template homedir = /home/%D/%U
        template shell = /bin/bash
        winbind use default domain = Yes
        winbind refresh tickets = Yes
        winbind offline logon = Yes
        winbind request timeout = 3
        kerberos method = secrets and keytab
# winbind rpc only = yes
        client signing = yes
        client use spnego = yes
        store dos attributes = yes
        ea support = yes