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what's up ?!

Unfortunately my last experience with linux have been disappointing. I make this topic because i tried a lot of things unsuccessfully.

Well... the problem started some days ago when i decided to try Xubuntu 18.04 live and my network was very unstable and i faced a lot of disconnections and slow speed. At the first moment i thought that could be the old driver for my RTL8723BE device, so i decided to reinstall the wifi driver but the problem still there. After that i tried to setup the DNS in my wifi connection and i changed some stuff to ignore the wifi power saving, but isn't worked as well.

Finally i decided to uninstall the network-manager,install the wicd and disable the secure-boot, but the problem persists.

Have ever seen something like this before ? Seriously guys, i'm very angry with those things and the system seems not to be prepared to the final user.

Another thing that i tried was ignore the IPV6 in my old network manager, but isn't work as well.

some suggestion about it ?

cleiton@cleiton-Z450LA:~$ lspci 
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
00:04.0 Signal processing controller: Intel Corporation Broadwell-U Processor Thermal Subsystem (rev 09)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3)
00:1c.2 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3)
00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #4 (rev e3)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
00:1f.6 Signal processing controller: Intel Corporation Wildcat Point-LP Thermal Management Controller (rev 03)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5286 PCI Express Card Reader (rev 01)
02:00.2 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller (rev 06)
03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter

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