My ubuntu 20.04 wifi very slow

Question

I just boot a new ubuntu 20.04.3, and when I restart my wifi gets slow, and sometimes it automatically disconnected:

My ubuntu version 20.04.4 when already update

What I have tried:

• reboot the computer multiple time
• check if the problem is from hardware, but it is not because of hardware

• I try to change /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf the value from 3 to 2, saved changes and rebooted.follow this : Ubuntu 20.04 Network Performance Extremely Slow

• I try to update my ubuntu to version 20.04.4

• I also try to boot ubuntu 20.04 again on my computer

But all the above solutions no one work for me.

Answer 1

I had the same problem with my Ubuntu 20.04.

I also changed the wifi.powersave from 3 to 2, but it didn't work.

The solution for me was editing the file /etc/nsswitch.conf and replacing the line: hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 with hosts: files dns.

This change increased the speed from approximately 35 Mbps to 380 Mbps. I got this tip from here https://itsfoss.com/speed-up-slow-wifi-connection-ubuntu/.

So far, the wifi connection also looks stable.