Проблема с Wi-Fi в ubuntu 14.04 [дубликат]

Я установил Ubuntu 15.04 на свой ноутбук с картой Wi-Fi RTL8723BE. Но он всегда отключается от сети. Я пробовал echo "options rtl8723be fwlps = N ips = N" | sudo tee /etc/modprobe.d/rtl8723be.conf, но это не помогло. Что я могу сделать, чтобы предотвратить отключение Wi-Fi? Если я обновлюсь до ядра 4.X, поможет ли это?

~ $ lspci -knn | grep Net -A2

09:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
    Subsystem: Hewlett-Packard Company Device [103c:2231]
    Kernel driver in use: rtl8723be


~$ rfkill list
0: hci0: Bluetooth
    Soft blocked: yes
    Hard blocked: no
1: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no


~$ ifconfig && iwconfig && route -n && ping -c 1 google.com
eth0      Link encap:Ethernet  HWaddr 38:63:bb:cd:4a:7e  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:53 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:752 (752.0 B)  TX bytes:8445 (8.4 KB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:3870 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3870 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:314613 (314.6 KB)  TX bytes:314613 (314.6 KB)

wlan0     Link encap:Ethernet  HWaddr c0:38:96:6d:c4:83  
          inet addr:192.168.1.205  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::c238:96ff:fe6d:c483/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:15240 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14627 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:14410285 (14.4 MB)  TX bytes:2192744 (2.1 MB)

eth0      no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"DIR-615"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:90:4C:08:00:0D   
          Bit Rate=150 Mb/s   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr=2347 B   Fragment thr:off
          Power Management:off
          Link Quality=70/70  Signal level=-22 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:186   Missed beacon:0

lo        no wireless extensions.

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    400    0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 wlan0
PING google.com.Dlink (172.26.136.19) 56(84) bytes of data.
64 bytes from 19.136.26.172.in-addr.arpa (172.26.136.19): icmp_seq=1 ttl=249 time=102 ms

--- google.com.Dlink ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 102.547/102.547/102.547/0.000 ms