connesct to network (wifi) with Lenovo ThinkPad e504

Hello I have a laptop that I recently installed Trisquel 8.0 LTS Flidas, But I do not have the ability to connect to wifi I tried all the ways I found on the Internet searches, but I still can not connect At the moment, I can only connect to the Internet through mobile phones (usb tethering) I am resident in Iran and I am limited by the options offered by the FSF () Please, if possible, give suggestions in order to fix the defect in the form of software and not hardware  $ uname -a Linux life 4.4.0-137-generic #163+8.0trisquel2 SMP Tue Oct 2 10:35:51 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux i@life:~$ iw list i@life:~$ ifconfig enp4s0    Link encap:Ethernet  HWaddr 28:d2:44:d8:9b:82            UP BROADCAST MULTICAST  MTU:1500  Metric:1           RX packets:0 errors:0 dropped:0 overruns:0 frame:0           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B) enp4s0:avahi Link encap:Ethernet  HWaddr 28:d2:44:d8:9b:82            inet addr:169.254.9.217  Bcast:169.254.255.255  Mask:255.255.0.0           UP BROADCAST MULTICAST  MTU:1500  Metric:1 lo        Link encap:Local Loopback            inet addr:127.0.0.1  Mask:255.0.0.0           inet6 addr: ::1/128 Scope:Host           UP LOOPBACK RUNNING  MTU:65536  Metric:1           RX packets:1658171 errors:0 dropped:0 overruns:0 frame:0           TX packets:1658171 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1           RX bytes:432348201 (432.3 MB)  TX bytes:432348201 (432.3 MB) i@life:~$ iwconfig lo        no wireless extensions. enp4s0    no wireless extensions. i@life:~$ ifconfig enp0s20u2 Link encap:Ethernet  HWaddr e2:53:55:8e:2f:c3            inet addr:192.168.42.249  Bcast:192.168.42.255  Mask:255.255.255.0           inet6 addr: fe80::e9a3:253e:ea3e:b7b6/64 Scope:Link           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1           RX packets:5 errors:0 dropped:0 overruns:0 frame:0           TX packets:14 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000           RX bytes:667 (667.0 B)  TX bytes:11213 (11.2 KB) enp4s0    Link encap:Ethernet  HWaddr 28:d2:44:d8:9b:82            UP BROADCAST MULTICAST  MTU:1500  Metric:1           RX packets:0 errors:0 dropped:0 overruns:0 frame:0           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B) enp4s0:avahi Link encap:Ethernet  HWaddr 28:d2:44:d8:9b:82            inet addr:169.254.9.217  Bcast:169.254.255.255  Mask:255.255.0.0           UP BROADCAST MULTICAST  MTU:1500  Metric:1 lo        Link encap:Local Loopback            inet addr:127.0.0.1  Mask:255.0.0.0           inet6 addr: ::1/128 Scope:Host           UP LOOPBACK RUNNING  MTU:65536  Metric:1           RX packets:1658433 errors:0 dropped:0 overruns:0 frame:0           TX packets:1658433 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1           RX bytes:432403581 (432.4 MB)  TX bytes:432403581 (432.4 MB) sudo nano /etc/NetworkManager/NetworkManager.conf [main] plugins=ifupdown,keyfile,ofono dns=dnsmasq [ifupdown] managed=false [device] wifi.scan-rand-mac-address=no