I think i solve the problem using this process:
1º Fresh Ubuntu system.
2º Pick another driver for the chipset card -> rtlwifi-next ->
3º Reboot the machine.
So you can try to solve problem for stable version: 26th April Stable Ubuntu
NOTE: i can not confirme that this will work in the kernel 4.16.
** Attachment added: "speedtest.txt"
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Wifi realtek 8822be BUG <=18.04
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