I don't know if this might help, but here are some troubleshooting information :
1. Is your network card set to UP??
It should be some what similar to this:
$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp3s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether c8:0a:a9:5f:da:e2 brd ff:ff:ff:ff:ff:ff
3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000
link/ether 78:e4:00:05:2f:1e brd ff:ff:ff:ff:ff:ff
5: wlp0s18f2u1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
link/ether d8:5d:4c:8c:6f:6d brd ff:ff:ff:ff:ff:ff
9: mon0: <BROADCAST,ALLMULTI,PROMISC,NOTRAILERS,UP,LOWER_UP> mtu 1500 qdisc mq state UNKNOWN mode DEFAULT group default qlen 1000
link/ieee802.11/radiotap d8:5d:4c:8c:6f:6d brd ff:ff:ff:ff:ff:ff
See the UP in angular bracket wlp2s0 but there is none wlp0s18f2u1 .................
2. When you issue any of the commands are you already associated with a access point??
if so try deauthenticating it.....
3. Also what is the output of dmesg | tail
does it have output like
device mon0 entered promiscuous mode
device mon0 left promiscuous mode
Also you could try dmesg | grep <interface_name>