Hello Community.
AFTER INSTALLING :
i have recently installed KDE Plasma version 5.12.4 . i can easily connect with wired connection but i can't connect with wifi.please help me to use wifi on this linux.i love its GUI .
AFTER SEARCHING ON GOOGLE :
after i searched it on google , i installed some drivers and after reboot i can access wifi but it has really weak signals. here is some information :

lspci output :

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00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1566
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mullins [Radeon R4/R5 Graphics]
00:01.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Kabini HDMI/DP Audio
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 156b
00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:02.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 16h Processor Functions 5:1
00:08.0 Encryption controller: Advanced Micro Devices, Inc. [AMD] Device 1537
00:10.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB XHCI Controller (rev 11)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode]
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 39)
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 39)
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 42)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD] FCH Azalia Controller (rev 02)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 11)
00:14.7 SD Host controller: Advanced Micro Devices, Inc. [AMD] FCH SD Flash Controller (rev 01)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1580
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1581
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1582
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1583
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1584
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 1585
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller (rev 07)
05:00.0 Network controller: Broadcom Limited BCM43142 802.11b/g/n (rev 01)
06:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader (rev 01)


iwconfig output:

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wlp5s0    IEEE 802.11  ESSID:"Area 43" 
          Mode:Managed  Frequency:2.437 GHz  Access Point: C4:A8:1D:42:96:2E   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
         
lo        no wireless extensions.

enp1s0    no wireless extensions.


ifconfig output :

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enp1s0    Link encap:Ethernet  HWaddr c4:54:44:a1:de:91 
          inet addr:192.168.0.43  Bcast:192.168.0.255  Mask:255.255.255.0                                                                                                                       
          inet6 addr: fe80::acf9:bab6:ceb8:eda9/64 Scope:Link                                                                                                                                   
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1                                                                                                                                   
          RX packets:24409 errors:0 dropped:0 overruns:0 frame:0                                                                                                                               
          TX packets:20804 errors:0 dropped:0 overruns:0 carrier:0                                                                                                                             
          collisions:0 txqueuelen:1000
          RX bytes:26419044 (26.4 MB)  TX bytes:2086403 (2.0 MB)

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:1231 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1231 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:179696 (179.6 KB)  TX bytes:179696 (179.6 KB)

wlp5s0    Link encap:Ethernet  HWaddr 18:cf:5e:63:23:e6 
          inet addr:192.168.0.60  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::1e0:378:dc3a:50fe/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:335 errors:0 dropped:0 overruns:0 frame:41961
          TX packets:220 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:61486 (61.4 KB)  TX bytes:20933 (20.9 KB)
          Interrupt:47

I HAVE GOT WIFI BUT IT HAS ONLY ONE SIGNAL WHILE SITTING WITH EVEN WIFI DEVICE.looking forward for your response !!!