cttc@cttc-desktop:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 8a:85:ad:db:65:a2 brd ff:ff:ff:ff:ff:ff
3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:04:4b:ec:20:81 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.45/24 brd 192.168.1.255 scope global dynamic noprefixroute eth0
valid_lft 43164sec preferred_lft 43164sec
inet6 fe80::fc6e:ca78:a7ef:969/64 scope link noprefixroute
valid_lft forever preferred_lft forever
4: l4tbr0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether a2:83:44:92:e2:c9 brd ff:ff:ff:ff:ff:ff
5: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether b4:74:9f:b4:7e:96 brd ff:ff:ff:ff:ff:ff
6: rndis0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast master l4tbr0 state DOWN group default qlen 1000
link/ether a2:83:44:92:e2:c9 brd ff:ff:ff:ff:ff:ff
7: usb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast master l4tbr0 state DOWN group default qlen 1000
link/ether a2:83:44:92:e2:cb brd ff:ff:ff:ff:ff:ff
8: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:6f:6a:fd:ba brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
valid_lft forever preferred_lft forever
'''
the AR928X Wireless Network Adapter has known issues [very unusual for Atheros products]
which build of Linux are you using?
'''cttc@cttc-desktop:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.5 LTS"
I hope you can see it properly