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What do you mean? Is my router`s condiguration is incorrect ? As I said, my router is set to WPA2-AES encryption. :?:

Here you are: http://paste.ubuntu.com/p/CwxVvvWndz/

Still the same :(

However, no. Everything goes back after rebooting. What can I do to make these changes permanently?

Thank you so much! :D
These changes solved everything. @Jeremy you are the best.

Hi, I hope that somebody will check this thread again :D

I've checked router configuration. I do not have mixed WPA/WPA2. I have this configuration which you have mentioned (WPA2-AES)
And...

Oh sorry for that. Here you are: http://termbin.com/yxg7 O:)

Oh right, thank you @praseodym for your help. I have done the wireless script. Here's the output: https://pastebin.com/YWU7jthq

Could you be more specific? What are wireless script and sticky thread ?

It doesn't solve slow connection. Still the same :(.

Hi,

I've posted here ealier: https://ubuntuforums.org/showthread.php?t=2392862 .
It was successfully resolved but still I have one problem with WiFI.

I have two OS on my laptop: Windows and...

Everything works now :p

Wow thanks https://ubuntuforums.org/customavatars/avatar1924242_5.gif jeremy31

Hi,

I have just installed Ubuntu 18.04 on my laptop and system seems not to enable my WiFi. I was trying some solutions on Internet which most of them was connect to Ubuntu 16 but it has not...