Ubuntu server nmcli is not showing SSIDs

Question

I have Raspberry Pi 4 with Ubuntu server 64 bit installed. I'm trying to connect my Pi with another Wi-Fi but unable to connect. I used netplan to connect with first Wi-Fi successfully connected. but later on, tried to connect with different SSID using nmcli but device is not listing SSIDs and or list.

I have tried below steps

sudo nano /etc/network/interface.
auto wlan0
iface wlan0 inet dhcp

sudo iwlist wlan0 scan

its list all the wifi properly

sudo nmcli device wifi list

IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY

test 2 :

$ rfkill list 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no

2. sudo /etc/init.d/networking restart && dhclient

[ ok ] Restarting networking (via systemctl): networking.service. RTNETLINK answers: Operation not permitted RTNETLINK answers: Operation not permitted

4.    nmcli radio 

WIFI-HW WIFI WWAN-HW WWAN
enabled enabled enabled enabled

nmcli radio wifi on

sudo nmcli device wifi list

IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY

I tried nmtui its also not showing Wi-Fi list

are there any methods I can try to connect with my other Wi-Fi?

Answer 1

Instead of nmcli use netplan.

open yaml file and add wifi details in(spaces are important) -
/etc/netplan/50-cloud-init.yaml

network:
version: 2
ethernets:
    eth0:
        optional: true
        dhcp4: true
# add wifi setup information here ...
wifis:
    wlan0:
        optional: true
        access-points:
            "ssid":
                password: "123pass00"
        dhcp4: true
        dhcp6: true

save and use command - sudo netplan try