LinuxQuestions.org - New install. Wi-Fi setup problems

Hi.
I'm a new user, exploring potential use of M4Linux on an older computer.

Installation went alright, but I'm stuck with Wifi setup.I have an usb adapter which is recognized by the os, but I cannot set it up to connect to my wireless network.
Netconfig doesn't resolve the problem.
I found in one of the earlier postings a ref to wpa-gui, and that seems to have problems too.

root@4MLinux:~$ wpa_gui
wpa-gui: /usr/lib/libQt5Core.so.5: version `Qt_5.13' not found (required by wpa-gui)
root@4MLinux:~$ netconfig
root@4MLinux:~$ connect
Connecting via the wlan0 interface:
udhcpc: started, v1.30.1
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: no lease, failing
root@4MLinux:~$

root@4MLinux:/etc/net/wifi$ cat wifi.conf
# Set essid (the Network Name) for your WiFi:
ESSID=MyNetwork

# Set mode (the Operating Mode) for your WiFi:
MODE=auto

# Set key (the WEP Encryption Key) for your WiFi:
KEY=off

# Set WPA Supplicant to control your WiFi:
WPA=yes

# N O T E:
# If you set WPA to "yes", you will also have to edit
# the /etc/net/wifi/wpa_supplicant.conf file.

# H I N T:
# You can run 'wifiscan' command to scan
# for available wireless networks.
root@4MLinux:/etc/net/wifi$

root@4MLinux:~$ iwconfig
eth1 no wireless extensions.

wlan0 unassociated Nickname:"rtl_wifi"
Mode:Managed Access Point: Not-Associated Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

eth0 no wireless extensions.

lo no wireless extensions.

root@4MLinux:~$ root@4MLinux:~$ lsusb
Bus 001 Device 002: ID 0bda:8172 Realtek Semiconductor Corp. RTL8191SU 802.11n WLAN Adapter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 004: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
Bus 004 Device 003: ID 413c:2011 Dell Computer Corp. Multimedia Pro Keyboard
Bus 004 Device 002: ID 413c:1005 Dell Computer Corp. Multimedia Pro Keyboard Hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
root@4MLinux:~$

root@4MLinux:/etc/net/wifi$ cat wpa*conf
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=root
update_config=1

network={
ssid="MyNetwork"
psk="3890c5b47fbb01f553f746db808ffeef89c55a5e420e5149238ea9e04c068bb8"
key_mgmt=WPA-PSK
pairwise=CCMP TKIP
auth_alg=OPEN
}
root@4MLinux:/etc/net/wifi$

Thank you for any advice you can provide.