Verifique o driver necessário para o seu computador usando
lspci
No meu caso:
sumit@Lenovo-Z50-70:~/Documents/programs$ lspci
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 3 (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)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)
02:00.0 Network controller: Broadcom Corporation BCM43142 802.11b/g/n (rev 01)
03:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 840M] (rev ff)
No meu caso, trata-se do Controlador Gigabit Ethernet da Realtek Semiconductor Co., Ltd. RTL8111 / 8168/8411 (rev 10). Use o link a seguir para drivers realtek
http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=13&PFid=5&Level=5&Conn=4&DownTypeID=3&GetDown=false
Se você não tiver uma conexão com a Internet, faça isso em qualquer outro sistema. Faça o download dele & amp; copie-o para o desktop do seu sistema. Extraia. Abra o terminal. Use os comandos
cd Desktop/r8168-8.041.01 (go to the extracted folder)
sudo ./autorun.sh
Digite sua senha. Isso instalará o driver & amp; conexão será estabelecida. Se não funcionar, tente reiniciar seu sistema.
Para o Wi-Fi, veja esta resposta se o seu sistema tiver drivers Broadcom Wireless:
http://askubuntu.com/questions/55868/installing-broadcom-wireless-drivers