Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

//lib/systemd/system/ModemManager.service

 [Unit]
Description=Modem Manager

[Service]
Type=dbus
BusName=org.freedesktop.ModemManager1
ExecStart=/usr/sbin/ModemManager --filter-policy=strict
StandardError=null
Restart=on-abort
CapabilityBoundingSet=CAP_SYS_ADMIN
ProtectSystem=true
ProtectHome=true
PrivateTmp=true
RestrictAddressFamilies=AF_NETLINK AF_UNIX
NoNewPrivileges=true
User=root

[Install]
WantedBy=multi-user.target
Alias=dbus-org.freedesktop.ModemManager1.service