I think i solve the problem using this process:

1º Fresh Ubuntu system.
2º Pick another driver for the chipset card -> rtlwifi-next -> 
https://github.com/rtlwifi-linux/rtlwifi-next
3º Reboot the machine.


So you can try to solve problem for stable version: 26th April Stable Ubuntu 
18.04 LTS

NOTE: i can not confirme that this will work in the kernel 4.16.


** Attachment added: "speedtest.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1761693/+attachment/5105646/+files/speedtest.txt

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Title:
  Wifi  realtek 8822be BUG <=18.04

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