请注意这个问题不是如何使 Realtek RTL8723BE 无线网卡工作？
在这个问题中，用户可以连接到无线网络，但会间歇性地断线。在我的情况中，Ubuntu 没有列出任何要连接的无线网络。此外，如果您阅读了这个问题的评论部分，您会发现重复问题中提到的解决方法已经尝试过，但没有帮助。
以下是根据重复问题的答案尝试的：下载了重复问题建议的 rtlwifi 和 dkms pkg，并成功运行了“sudo dpkg -i dkms_2.2.0.3-2ubuntu11_all.deb rtlwifi-new-dkms_0.10_all.deb”。重新启动后发现运行“ifconfig”时无法再找到无线设备 wlp2s0。此外，屏幕右上角的 wifi 选项不再可用。由于我的情况变得更糟，删除了 dkms 包，我的 wlp2s0 恢复了，但仍然没有无线连接。
我安装了 Ubuntu Xenial(16.04.2)，但找不到要连接的无线网络。无线开关已打开，无线网络已启用，设备处于启动状态
wlp2s0 Link encap:Ethernet HWaddr 94:53:30:4d:84:27
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
有关我的设置的更多信息：
$ lspci -nn | grep 0280
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
$ lsusb
Bus 001 Device 004: ID 046d:c52f Logitech, Inc. Unifying Receiver
Bus 001 Device 003: ID 05c8:0383 Cheng Uei Precision Industry Co., Ltd (Foxlink)
Bus 001 Device 002: ID 0438:7900 Advanced Micro Devices, Inc.
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 002: ID 0bda:b006 Realtek Semiconductor Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
$ rfkill list all
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
$ dmesg | grep -e wlan -e b43
[ 15.006188] rtl8723be 0000:02:00.0 wlp2s0: renamed from wlan0
$ sudo modprobe b43
$
这是一个双启动系统，当我使用 Windows 10 启动时，我能够找到无线网络并使用相同的硬件成功连接。
尝试了提到的解决方法这里但没有帮助。
Ubuntu 在家里可以毫无问题地找到无线连接。当我去图书馆时，Ubuntu 却无法找到任何无线网络。
当我在图书馆时，我重新启动了 Ubuntu 并捕获了系统日志消息。以下是我在系统日志中看到的似乎与我调试问题相关的消息：
Feb 20 09:56:52 voyager kernel: [ 14.026332] rtl8723be 0000:02:00.0:
enabling device (0000 -> 0003) Feb 20 09:56:52 voyager kernel: [
14.051292] rtl8723be: Using firmware rtlwifi /rtl8723befw.bin Feb 20 09:56:52 voyager kernel: [ 14.084384] ieee80211 phy0: Selected rate
con trol algorithm 'rtl_rc' Feb 20 09:56:52 voyager kernel: [
14.084789] rtlwifi: rtlwifi: wireless switch is on Feb 20 09:56:52 voyager kernel: [ 14.086744] rtl8723be 0000:02:00.0 wlp2s0: re named
from wlan0 .... Feb 20 09:56:54 voyager NetworkManager[794]: <info>
[1487602614.9362] NetworkMa nager (version 1.2.2) is starting... Feb
20 09:56:54 voyager NetworkManager[794]: <info> [1487602614.9365]
Read conf ig: /etc/NetworkManager/NetworkManager.conf (etc:
default-wifi-powersave-on.conf ) Feb 20 09:56:55 voyager
thermald[820]: Unsupported cpu model, use thermal-conf.x ml file or
run with --ignore-cpuid-check Feb 20 09:56:55 voyager thermald[820]:
THD engine start failed Feb 20 09:56:55 voyager NetworkManager[794]:
<info> [1487602615.1807] manager[0 x26811a0]: monitoring kernel
firmware directory '/lib/firmware'. Feb 20 09:56:55 voyager
NetworkManager[794]: <info> [1487602615.1808] monitorin g ifupdown
state file '/run/network/ifstate'. Feb 20 09:56:55 voyager
NetworkManager[794]: <info> [1487602615.3325] dns-mgr[0 x26930b0]:
set resolv-conf-mode: dnsmasq, plugin="dnsmasq" Feb 20 09:56:55
voyager NetworkManager[794]: <info> [1487602615.3326] dns-mgr[0
x26930b0]: using resolv.conf manager 'resolvconf' Feb 20 09:56:55
voyager NetworkManager[794]: <info> [1487602615.4015] rfkill1: found
WiFi radio killswitch (at
/sys/devices/pci0000:00/0000:00:02.3/0000:02:00.
0/ieee80211/phy0/rfkill1) (driver rtl8723be) Feb 20 09:56:55 voyager
systemd[1]: Started Network Manager. Feb 20 09:56:55 voyager
systemd[1]: Starting Network Manager Wait Online... Feb 20 09:56:55
voyager systemd[1]: Reached target Network. Feb 20 09:56:55 voyager
dbus[748]: [system] Activating via systemd: service name
='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.servic e' Feb 20 09:56:55
voyager systemd[1]: Starting Network Manager Script Dispatcher S
ervice... Feb 20 09:56:55 voyager ModemManager[795]: <info> Couldn't
find support for dev ice at
'/sys/devices/pci0000:00/0000:00:02.2/0000:01:00.0': not supported by
any plugin Feb 20 09:56:55 voyager ModemManager[795]: <info>
Couldn't find support for dev ice at
'/sys/devices/pci0000:00/0000:00:02.3/0000:02:00.0': not supported by
any plugin ... Feb 20 09:56:55 voyager NetworkManager[794]: <info>
[1487602615.8595] init! Feb 20 09:56:55 voyager NetworkManager[794]:
<info> [1487602615.8600] managemen t mode: unmanaged Feb 20 09:56:55
voyager NetworkManager[794]: <info> [1487602615.8608] devices a dded
(path: /sys/devices/pci0000:00/0000:00:02.2/0000:01:00.0/net/enp1s0,
iface: enp1s0) Feb 20 09:56:55 voyager NetworkManager[794]: <info>
[1487602615.8608] device ad ded (path:
/sys/devices/pci0000:00/0000:00:02.2/0000:01:00.0/net/enp1s0, iface:
enp1s0): no ifupdown configuration found. Feb 20 09:56:55 voyager
NetworkManager[794]: <info> [1487602615.8609] devices a dded (path:
/sys/devices/pci0000:00/0000:00:02.3/0000:02:00.0/net/wlp2s0, iface:
wlp2s0) Feb 20 09:56:55 voyager NetworkManager[794]: <info>
[1487602615.8609] device ad ded (path:
/sys/devices/pci0000:00/0000:00:02.3/0000:02:00.0/net/wlp2s0, iface:
wlp2s0): no ifupdown configuration found. Feb 20 09:56:55 voyager
NetworkManager[794]: <info> [1487602615.8609] devices a dded (path:
/sys/devices/virtual/net/lo, iface: lo) Feb 20 09:56:55 voyager
NetworkManager[794]: <info> [1487602615.8609] device ad ded (path:
/sys/devices/virtual/net/lo, iface: lo): no ifupdown configuration fo
und. Feb 20 09:56:55 voyager NetworkManager[794]: <info>
[1487602615.8609] end _init . Feb 20 09:56:55 voyager
NetworkManager[794]: <info> [1487602615.8610] settings: loaded
plugin ifupdown: (C) 2008 Canonical Ltd. To report bugs please use
the NetworkManager mailing list.
(/usr/lib/x86_64-linux-gnu/NetworkManager/libnm-set
tings-plugin-ifupdown.so) Feb 20 09:56:55 voyager NetworkManager[794]:
<info> [1487602615.8615] SettingsP lugin-Ofono: init! Feb 20 09:56:55
voyager NetworkManager[794]: <warn> [1487602615.8616] SettingsP
lugin-Ofono: file doesn't exist: /var/lib/ofono Feb 20 09:56:55
voyager NetworkManager[794]: <info> [1487602615.8616] SettingsP
lugin-Ofono: end _init. Feb 20 09:56:55 voyager NetworkManager[794]:
<info> [1487602615.8616] settings: loaded plugin ofono: (C)
2013-2016 Canonical Ltd. To report bugs please use th e
NetworkManager mailing list.
(/usr/lib/x86_64-linux-gnu/NetworkManager/libnm-s
ettings-plugin-ofono.so) Feb 20 09:56:55 voyager NetworkManager[794]:
<info> [1487602615.8616] (40512336 ) ... get_connections. Feb 20
09:56:55 voyager NetworkManager[794]: <info> [1487602615.8617]
(40512336 ) ... get_connections (managed=false): return empty list.
系统日志消息的完整部分已可用这里
答案1
运行此步骤后此问题解决
echo "options rtl8723be ant_sel=2" | sudo tee /etc/modprobe.d/rtl8723be.conf
然后按照这里提到的重新启动