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This question already has an answer here:

I would like to reinstall the driver of my wifi card. In order to find out the name of my driver, I have used:

sudo lshw -C network

and the output for the wifi card is

*-network DISABLED
       description: Wireless interface
       product: RTL8723BE PCIe Wireless Network Adapter
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: wlan0
       version: 00
       serial: 4c:bb:58:dc:ad:10
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rtl8723be driverversion=4.2.0-30-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
       resources: irq:19 ioport:1000(size=256) memory:90400000-90403fff

Therefore, I think the device name is RTL8723BE PCIe Wireless Network Adapter.

Can anybody guide me how to reinstall its driver again?

marked as duplicate by Pilot6, Community Mar 19 '16 at 23:01

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    How did you install that driver the first time? And why do you want to re-install it? – Pilot6 Mar 19 '16 at 18:43
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    It has been installed automatically when I installed Ubuntu. It works very well after turning on the computer. However, after sometime, 10 to 15 minutes, the internet disconnects. It is still connected to the router, but I cannot access internet. Other devices that are connected to the router still work very well. Therefore, the problem is not from router. I have also checked the power saving settings of the wireless card and it is off (as I think it should be off). – Unique Mar 19 '16 at 19:49
  • When I restart my comupter, I have access to the internet, but again, after a few minutes, the internet disconnects. It may be a problem in the driver and I want to reinstall or possibly find another driver. – Unique Mar 19 '16 at 19:49
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Search for "Software Sources" on the dash. On the "Additional drivers" tab, you should find your wifi card's driver, most likely disabled. Enable it and apply changes.See here

  • Additional drivers is applicable only to Broadcom adapters. – Pilot6 Mar 19 '16 at 18:44

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