我正在运行全新安装的 ubuntu 14.04 并使用以下 wifi 适配器：
系统盘
Bus 003 Device 005: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
我的连接非常不稳定，几分钟后就断开了。然后我需要禁用 wifi 并重新激活它。
以下是更多信息（基于此问题）：Ubuntu 12.04 上的 wifi 每隔几分钟就会掉线）
lsmod | grep rtl
rtl8192cu 67723 0
rtl_usb 18448 1 rtl8192cu
rtlwifi 63475 2 rtl_usb,rtl8192cu
rtl8192c_common 53172 1 rtl8192cu
mac80211 626489 3 rtl_usb,rtlwifi,rtl8192cu
cfg80211 484040 2 mac80211,rtlwifi
iwconfig | grep Power
eth0 no wireless extensions.
lo no wireless extensions.
Bit Rate=6.5 Mb/s Tx-Power=20 dBm
Power Management:off
May 3 17:03:34 Guava dhclient: DHCPREQUEST of 192.168.1.26 on wlan0 to 255.255.255.255 port 67 (xid=0x237c41a8)
May 3 17:03:34 Guava NetworkManager[939]: <info> (wlan0): DHCPv4 state changed preinit -> reboot
May 3 17:03:34 Guava NetworkManager[939]: <info> address 192.168.1.26
May 3 17:03:34 Guava NetworkManager[939]: <info> prefix 24 (255.255.255.0)
May 3 17:03:34 Guava NetworkManager[939]: <info> gateway 192.168.1.254
May 3 17:03:34 Guava NetworkManager[939]: <info> nameserver '192.168.1.254'
May 3 17:03:34 Guava NetworkManager[939]: <info> nameserver '192.168.1.254'
May 3 17:03:34 Guava NetworkManager[939]: <info> domain name 'lan'
May 3 17:03:34 Guava NetworkManager[939]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Configure Commit) scheduled...
May 3 17:03:34 Guava NetworkManager[939]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Commit) started...
May 3 17:03:34 Guava avahi-daemon[829]: Joining mDNS multicast group on interface wlan0.IPv4 with address 192.168.1.26.
May 3 17:03:34 Guava avahi-daemon[829]: New relevant interface wlan0.IPv4 for mDNS.
May 3 17:03:34 Guava avahi-daemon[829]: Registering new address record for 192.168.1.26 on wlan0.IPv4.
May 3 17:03:35 Guava NetworkManager[939]: <info> (wlan0): device state change: ip-config -> secondaries (reason 'none') [70 90 0]
May 3 17:03:35 Guava NetworkManager[939]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Commit) complete.
May 3 17:03:35 Guava NetworkManager[939]: <info> (wlan0): device state change: secondaries -> activated (reason 'none') [90 100 0]
May 3 17:03:35 Guava NetworkManager[939]: <info> NetworkManager state is now CONNECTED_GLOBAL
May 3 17:03:35 Guava NetworkManager[939]: <info> Policy set 'HomeWIFI' (wlan0) as default for IPv4 routing and DNS.
May 3 17:03:35 Guava NetworkManager[939]: <info> Writing DNS information to /sbin/resolvconf
May 3 17:03:35 Guava NetworkManager[939]: <info> Activation (wlan0) successful, device activated.
提前致谢。