Disable the following service for dhcpcd:

sudo update-rc.d dhcpcd disable

Empty the file “interfaces” in:

sudo nano /etc/network/interfaces

Install NetworkManager:

sudo apt-get install network-manager

Enable NetworkManager:

Edit the /etc/NetworkManager/NetworkManager.conf file

sudo nano /etc/NetworkManager/NetworkManager.conf

make sure: managed=true

[ifupdown]

managed=true

Enable Ethernet and wifi examples

Wifi: (static not dhcp)

Add:

sudo nmcli -p connection add type wifi ifname wlan0 ssid “WIFI SSID”

Modify:

sudo nmcli con mod wifi-wlan0 ipv4.method manual ipv4.addresses “192.168.88.70/24” ipv4.gateway “192.168.88.1” ipv4.dns “192.168.88.1” wifi-sec.key-mgmt wpa-psk wifi-sec.psk PresharedKeyTypeItHere

Ethernet :(static not dhcp)

sudo nmcli -p connection show

sudo nmcli con mod “Wired connection 1” ipv4.method manual ipv4.addresses “192.168.88.80/24” ipv4.gateway “192.168.88.1” ipv4.dns “192.168.88.1”

Show some attributes:

sudo nmcli -p connection show “wifi-wlan0”

===============================================================================

Connection profile details (wifi-wlan0)

===============================================================================

connection.id: wifi-wlan0

connection.uuid: ???????????????????????????????

connection.stable-id: —

connection.interface-name: wlan0

connection.type: 802-11-wireless

connection.autoconnect: yes

connection.autoconnect-priority: 0

connection.autoconnect-retries: -1 (default)

connection.timestamp: 1505650728

connection.read-only: no

connection.permissions:

connection.zone: —

connection.master: —

connection.slave-type: —

connection.autoconnect-slaves: -1 (default)

connection.secondaries:

connection.gateway-ping-timeout: 0

connection.metered: unknown

connection.lldp: -1 (default)

——————————————————————————-

802-11-wireless.ssid: ?????????????????????????

802-11-wireless.mode: infrastructure

802-11-wireless.band: —

802-11-wireless.channel: 0

802-11-wireless.bssid: —

802-11-wireless.rate: 0

802-11-wireless.tx-power: 0

802-11-wireless.mac-address: —

802-11-wireless.cloned-mac-address: —

802-11-wireless.generate-mac-address-mask:–

802-11-wireless.mac-address-blacklist:

802-11-wireless.mac-address-randomization:default

802-11-wireless.mtu: auto

802-11-wireless.seen-bssids: 74:DA:38:98:66:08

802-11-wireless.hidden: no

802-11-wireless.powersave: default (0)

——————————————————————————-

802-11-wireless-security.key-mgmt: wpa-psk

802-11-wireless-security.wep-tx-keyidx: 0

802-11-wireless-security.auth-alg: —

802-11-wireless-security.proto:

802-11-wireless-security.pairwise:

802-11-wireless-security.group:

802-11-wireless-security.leap-username: —

802-11-wireless-security.wep-key0: <hidden>

802-11-wireless-security.wep-key1: <hidden>

802-11-wireless-security.wep-key2: <hidden>

802-11-wireless-security.wep-key3: <hidden>

802-11-wireless-security.wep-key-flags: 0 (none)

802-11-wireless-security.wep-key-type: 0 (unknown)

802-11-wireless-security.psk: <hidden>

802-11-wireless-security.psk-flags: 0 (none)

802-11-wireless-security.leap-password: <hidden>

802-11-wireless-security.leap-password-flags:0 (none)

——————————————————————————-

ipv4.method: manual

ipv4.dns: 192.168.88.1

ipv4.dns-search:

ipv4.dns-options: (default)

ipv4.dns-priority: 0

ipv4.addresses: 192.168.88.70/24

ipv4.gateway: 192.168.88.1

ipv4.routes:

ipv4.route-metric: -1

ipv4.ignore-auto-routes: no

ipv4.ignore-auto-dns: no

ipv4.dhcp-client-id: —

ipv4.dhcp-timeout: 0

ipv4.dhcp-send-hostname: yes

ipv4.dhcp-hostname: —

ipv4.dhcp-fqdn: —

ipv4.never-default: no

ipv4.may-fail: yes

ipv4.dad-timeout: -1 (default)

——————————————————————————-

ipv6.method: auto

ipv6.dns:

ipv6.dns-search:

ipv6.dns-options: (default)

ipv6.dns-priority: 0

ipv6.addresses:

ipv6.gateway: —

ipv6.routes:

ipv6.route-metric: -1

ipv6.ignore-auto-routes: no

ipv6.ignore-auto-dns: no

ipv6.never-default: no

ipv6.may-fail: yes

ipv6.ip6-privacy: -1 (unknown)

ipv6.addr-gen-mode: stable-privacy

ipv6.dhcp-send-hostname: yes

ipv6.dhcp-hostname: —

ipv6.token: —

——————————————————————————-

proxy.method: none

proxy.browser-only: no

proxy.pac-url: —

proxy.pac-script: —

——————————————————————————-

===============================================================================

Activate connection details (????????????????????????????????????????)

===============================================================================

GENERAL.NAME: wifi-wlan0

GENERAL.UUID: ??????????????????????????????????????

GENERAL.DEVICES: wlan0

GENERAL.STATE: activated

GENERAL.DEFAULT: no

GENERAL.DEFAULT6: no

GENERAL.VPN: no

GENERAL.ZONE: —

GENERAL.DBUS-PATH: /org/freedesktop/NetworkManager/ActiveConnection/2

GENERAL.CON-PATH: /org/freedesktop/NetworkManager/Settings/2

GENERAL.SPEC-OBJECT: /org/freedesktop/NetworkManager/AccessPoint/1

GENERAL.MASTER-PATH: —

——————————————————————————-

IP4.ADDRESS[1]: 192.168.88.70/24

IP4.GATEWAY: 192.168.88.1

IP4.DNS[1]: 192.168.88.1

——————————————————————————-

Make interface go up/down:

sudo ifconfig wifi-wlan0 down

sudo ifconfig wifi-wlan0 up

More info:

https://manpages.debian.org/stretch/network-manager/nmcli.1.en.html