I have latest KDE Neon, with Plasma 5 desktop. For sharing my wired internet to other devices via wifi, I have followed this easy guide: Create Wi-fi Hotspot Using KDE Plasma 5, but with an Android smartphone, I cannot see the new created SSID.
With this Android phone, I have connected successfully with many wifi networks. I don't suspect on it.
How can I diagnose the problem? Misconfiguration, KDE bug, wifi driver bug or problem with the card manufacturer?.
UPDATE
Result of ip addr show
command:
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: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
....
3: wlp2s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 78:92:9c:01:37:9c brd ff:ff:ff:ff:ff:ff
Number 1 is loopback, number 2 is ethernet and number 3 is regular wifi, and is unconnected. But wifi hotspot doesn't appear.