How to fix wifi in ubuntu?

Question

linux

Guys, I bought an asus x540s laptop. Installed Windu, everything works like a clock. I installed ubuntu, and away we go... After a certain time, wifi stops working... only reboot helps. Reconnecting doesn't help. Although it shows that the Wi-Fi is connected, but the Internet does not work. realtek rtl8723be card. What can be done to resolve. Tried turning off power save, didn't help. Ubuntu 14.04.
The axis is trying to reconnect to Wi-Fi but to no avail, disconnect. In the logs in the terminal, there is this garbage
[ 3786.678971] wlan0: authenticate with f8:d1:11:36:e8:f0
[ 3787.144056] wlan0: send auth to f8:d1:11:36:e8:f0 (try 1/3)
[ 3787.146859] wlan0: authenticated
[ 3787.148114] rtl8723be 0000:03:00.0 wlan0: disabling HT/VHT due to WEP/TKIP use
[ 3787.152050] wlan0: associate with f8:d1:11:36:e8:f0 (try 1/3)
[ 3787.156619] wlan0: RX AssocResp from f8:d1:11:36:e8:f0 (capab=0x431 status=0 aid=4)
[ 3787.158644] wlan0: associated
[ 3832.841509] wlan0: deauthenticating from f8:d1:11:36:e8:f0 by local choice (Reason: 3=DEAUTH_LEAVING)
[ 3832.885567] cfg80211: World regulatory domain updated:
[ 3832.885575 ] cfg80211: DFS Master region: unset
[ 3832.885578] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[ 3832.885582] cfg80211: (2402000 KHz - 2472000 KHz @ 40BiHz) 2000 mBm), (N/A)
[ 3832.885586] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 3832.885589] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 3832.885592] cfg80211: (5170000 KHz - 2494000 KHz @ 30000 KHz mBm), (N/A)
[ 3832.885596] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)

Answer 1

I also suffered with this for a long time) A
possible solution.
1 Install sudo apt-get install wpasupplicant wireless-tools
2 Uninstall network-manager completely
3 Set up Wi-Fi like here http://help.ubuntu.ru/wiki/%D0%BD%D0%B0%D1%81%D1 %8...
the problem seems to be in the realtek rtl8723be card, I had the same thing
2 It may also help to
open or create a file sudo gedit /etc/modprobe.d/rtl8723be.conf
and write this in there:
# Prevents the WiFi card from automatically sleeping and halting connection
options rtl8723be fwlps=0 swlps=0
reload