Bdtyktl

I have a dell latitude d620 on which i run both window 7 and ubuntu 17.10. but i discovered that whenever i log on ubuntu, it doesn't always find any network. it always search forever, something which is different when i log on to windows.
i have gone through many thread, but their answers seems not helping.
i will post the list of codes that i have run below and their result.

sudo lshw -C network



*-network                 

       description: Wireless interface

       product: PRO/Wireless 3945ABG [Golan] Network Connection

       vendor: Intel Corporation

       physical id: 0

       bus info: pci@0000:0c:00.0

       logical name: wlp12s0

       version: 02

       serial: 00:19:d2:49:fc:6f

       width: 32 bits

       clock: 33MHz

       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

       configuration: broadcast=yes driver=iwl3945 driverversion=4.13.0-38-generic firmware=15.32.2.9 latency=0 link=no multicast=yes wireless=IEEE 802.11

       resources: irq:24 memory:efdff000-efdfffff

  *-network DISABLED

       description: Ethernet interface

       product: NetXtreme BCM5752 Gigabit Ethernet PCI Express

       vendor: Broadcom Limited

       physical id: 0

       bus info: pci@0000:09:00.0

       logical name: enp9s0

       version: 02

       serial: 00:18:8b:a6:60:41

       capacity: 1Gbit/s

       width: 64 bits

       clock: 33MHz

       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation

       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.137 firmware=5752-v3.19 latency=0 link=no multicast=yes port=twisted pair

       resources: irq:18 memory:efcf0000-efcfffff

I tried

iwlist wlan0 scan

But it said

wlan0     Interface doesn't support scanning.

I tried:

iwconfig

result

wlp12s0   IEEE 802.11  ESSID:off/any  

      Mode:Managed  Access Point: Not-Associated   Tx-Power=15 dBm   

      Retry short limit:7   RTS thr:off   Fragment thr:off

      Power Management:off



lo        no wireless extensions.



enp9s0    no wireless extensions.

i tried this

lspci | grep -i -E wireless|ethernet  

and got this

    09:00.0 Ethernet controller: Broadcom Limited NetXtreme BCM5752 Gigabit Ethernet PCI Express (rev 02). 

0c:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)

This also:

sudo iwlist wlp12s0 s  

always see some network, but will not display it in the GUI

wlp12s0   Scan completed :

      Cell 01 - Address: A4:BA:76:74:97:EA

                Channel:6

                Frequency:2.437 GHz (Channel 6)

                Quality=64/70  Signal level=-46 dBm  

                Encryption key:off

                ESSID:"Xender_APd5dc"

                Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s

                          24 Mb/s; 36 Mb/s; 54 Mb/s

                Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s

                Mode:Master

                Extra:tsf=0000000001b34f0d

                Extra: Last beacon: 28ms ago

                IE: Unknown: 000D58656E6465725F415064356463

                IE: Unknown: 010882848B962430486C

                IE: Unknown: 030106

                IE: Unknown: 0706555320010B1E

                IE: Unknown: 200100

                IE: Unknown: 23021300

                IE: Unknown: 2A0100

                IE: Unknown: 32040C121860

                IE: Unknown: 2D1A200017FF00000000000000000000000000000000000000000000

                IE: Unknown: 3D1606080000000000000000000000000000000000000000

                IE: Unknown: 7F0104

                IE: Unknown: DD090010180200000C0000

                IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00

pls i need help, i've been on this for weeks.

cat /etc/NetworkManager/NetworkManager.conf

the result is below:

[main]

plugins=ifupdown,keyfile



[ifupdown]

managed=false



[device]

wifi.scan-rand-mac-address=no

for the second command

cat /etc/network/interfaces  

The result is as follow:

/etc/network/interfaces -- configuration file for 

ifup(8), ifdown(8)

 Generated by debian-installer.  



 The loopback interface

 auto lo

 iface lo inet loopback  

I also noticed that my computer do connect with the network that i use to set it up during installation whenever the network is available. Its a wireless network from my phone. But it won't even show the name of that network nor other networks. But my phone always tell me when the laptop connect with its hotspot. So i can't use any other WiFi network except one with that very name and password.
pls i need help
::,

Network manager was the problem, that thing made me suffer for 6 months. I solved this by running the following codes:

sudo apt-get install wicd



sudo service network-manager stop



sudo service wicd start