I have dell vostro 3446 version in laptop machine. I have now installed ubuntu 18.04 version. After that bluetooth and wifi has been stopped working. Even camera also stopped working. I think it has some missing drivers. Before than that I had ubuntu 16 LTS version, both bluetooth,wifi was working fine. Please suggest some better and easy solution for the same.

Output of some of the basic commands :
$ lspci -nnk | grep -iA3 net
07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0c)
Subsystem: Dell RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1028:0662]
Kernel driver in use: r8168
Kernel modules: r8168
08:00.0 3D controller [0302]: NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M] [10de:1140] (rev a1)

$ lsusb
Bus 001 Device 003: ID 064e:9205 Suyin Corp.
Bus 001 Device 002: ID 8087:8000 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 003: ID 2717:ff80
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

$ lsmod | grep cfg

$ uname -r
4.15.0-34-generic

Since it's a Dell, there's a good change it has a Broadcom wireless chipset. In the Ubuntu control center or software center (I'm not quite sure where they are hiding it these days), look for something called "Additional Drivers" and see if that helps recognize the wireless chipset.

You will find other useful diagnostic tools in this post: https://www.linuxquestions.org/quest...ux-4175434970/

Additional driver tab not showing any other driver related to wifi

Have you started working through the link that frankbell gave you? If so, can you paste some of the outputs here. Thanks.

$ /sbin/ifconfig
enp0s20u1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.42.82 netmask 255.255.255.0 broadcast 192.168.42.255
inet6 2405:205:c906:8b66:d9d2:c76c:cf7b:27b4 prefixlen 64 scopeid 0x0<global>
inet6 fe80::5718:497d:c807:6ecc prefixlen 64 scopeid 0x20<link>
inet6 2405:205:c906:8b66:45ee:23c2:b781:9c95 prefixlen 64 scopeid 0x0<global>
ether ae:7f:aa:af:4d:78 txqueuelen 1000 (Ethernet)
RX packets 12834 bytes 10011893 (10.0 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 10815 bytes 2140473 (2.1 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

enp7s0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether b8:2a:72:a4:7e:b7 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 41 base 0xe000

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 1275 bytes 107719 (107.7 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1275 bytes 107719 (107.7 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

$ lspci
00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b)
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 0b)
00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 1 (rev e4)
00:1c.3 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 4 (rev e4)
00:1c.4 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 5 (rev e4)
00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
08:00.0 3D controller: NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M] (rev a1)