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RTL8191SEvB Wireless能搜索到无线网络，但很难连接上
yy@yy-ThinkPad-Edge:~$ sudo lshw -numeric -class network
[sudo] password for yy:
*-network
description: Wireless interface
product: RTL8191SEvB Wireless LAN Controller [10EC:8172]
vendor: Realtek Semiconductor Co., Ltd. [10EC]
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlan0
version: 10
serial: 5c:ac:4c:ba:ce:0b
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtl8192se driverversion=3.13.0-32-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
resources: irq:17 ioport:3000(size=256) memory:f0300000-f0303fff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10EC:8168]
vendor: Realtek Semiconductor Co., Ltd. [10EC]
physical id: 0
bus info: pci@0000:09:00.0
logical name: eth0
version: 03
serial: 60:eb:69:89:bb:5e
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl_nic/rtl8168d-2.fw ip=192.168.222.142 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
resources: irq:42 ioport:5000(size=256) memory:f0204000-f0204fff memory:f0200000-f0203fff memory:f0220000-f023ffff
yy@yy-ThinkPad-Edge:~$

装一个网络管理前端

装一个网络管理前端，怎么装？

如果是图形界面，默认就带。 其实 - 实话是，换个不是 RTL的网卡，不是Broadcom的网卡。几乎没事了。

product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10EC:8168]
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl_nic/rtl8168d-2.fw ip=192.168.222.142 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s

viewtopic.php?p=3102888#p3102888
r8169 不是合適的驅動

product: RTL8191SEvB Wireless LAN Controller [10EC:8172]
configuration: broadcast=yes driver=rtl8192se driverversion=3.13.0-32-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn

2. rtl8192se 是 RTL8191SEvB 合適的驅動
https://wiki.debian.org/rtl819x#supported-rtl8192se
rtl8192se
PCI: 10EC:8172 Realtek Semiconductor Co., Ltd. RTL8191SEvB Wireless LAN Controller

3. Ubuntu 預設由 Network Manager 管理上網
Network Manager 預設同一時間 只能有一個網卡 成功上網
從 ip=192.168.222.142 已知 有線網卡 已成功上網 (但是 表現不正常)
所以 無線網卡 無法連線上網
要測試 無線網卡 能否成功連線上網
3-1. 從 Bios 把有線網卡 關閉
或
3-2. 從 右上方 連線圖示 有線連網設定 自動連線 打勾取消

不知道是不是呀。我的Ubuntu可以同时连两个无线网卡。。。