Solution to the disappearance of the Network icon from Ubuntu 11.04 to 12.04 and the failure to install the driver for the wireless network adapter

I upgraded Ubuntu to 12.04 In the Meizhou office two days ago. The result is that the network ID cannot be found, and the wireless connection cannot be accessed, the simplest test method is ifconfig, which does not find the eth1 (WL logical name) information. It turns out that the wireless network card does not have a driver. Look for the system settings -- add the driver, you can see that there is a Broadcom-sta driver, but it cannot be installed, as prompted:

Even if you check the logs and check the logs, you have to use the wired network to search for logs. We use ruijie on the campus network. Therefore, to connect to the Internet in Ubuntu, you must install the mentohost software, I am taught to write an automatic connection detection command in the startup configuration file. Otherwise, I have to restart mentohost every time. What's more, if no available network is detected, the startup of those systems will be very slow. The command is as follows:

First, let's solve the first problem. I searched the network and tried a variety of methods. The command is as follows:
Gconftool -- Recursive-unset/apps/panel
Rm-RF ~ /. Gconf/apps/panel
Pkill gnome-panel
It means restoring GNOME desktop to the default setting. Meimei's network logo has appeared (slice)

The second problem is that wireless network card cannot drive, search again, try, to the official website, according to https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx

Finally, you must note that ~ $ Sudo apt-Get install bcmwl-kernel-source after the command is executed, the system prompts that it is the latest and does not need to be installed. However, even after I restart the system, it cannot be identified, simply remove it and re-install it. Then, the wireless network will be detected after the restart. The fan icon starts to detect the wireless network identifier, such as CMCC, in the command line ifconfig, you can also see that the driver has been installed (in fact, the broad-STA in the additional driver is installed, and the bcmwl-kernel-source should be updated, so this driver can be installed.

In addition, there are actually many wireless Internet access methods, such as self-built free WiFi in public places. For example, if you find JNU in the Library (Windows or Linux), click Connect, then, when you open the webpage, enter the account, which is the ruijie account and password.

The second type is also a hotspot for construction by operators, but it is not free. For example, if CMCC is found in the dormitory, click the connection and open the webpage, the mobile phone number should be used as an account, the password is sent when the mobile phone activates the WLAN service (the mobile phone sends traffic to the WLAN in the area not limited to 30 hours per month), that is, the free traffic of the mobile phone WLAN is used to access the Internet.

The third type is generally the use of wireless routing in the home or office space. Needless to say, if it is a broadcast type, you can directly connect to it and enter the password. If it is a hidden type, you should create a wireless connection, now you must know the SSID and password.

The last small problem was that the libreoffice suite could not be opened after the upgrade. It should be a matter of character encoding. First, enter libreoffice writter on the command line to see if there is a magic code prompt when the command line is started, the result is "An error occurred while initializing the month string". When you look at the calendar, the characters of the week are in disorder, and the source of the problem is better solved. A search on the Internet will soon be able to solve the problem, not mentioned.