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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

ubuntu version

What I have tried:

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

check if hardware problem

try available solution

  • 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.

Serg
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Navin Seab
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  • What's your WiFi MTU? ip link will show. – waltinator May 28 '22 at 01:13
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    Does this answer your question? Ubuntu 20.04 Wifi Keeps Dropping – waltinator May 28 '22 at 01:13
  • @waltinator 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: wlo1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DORMANT group default qlen 1000 link/ether dc:f5:05:ff:50:ed brd ff:ff:ff:ff:ff:ff altname wlp3s0 I got this output – Navin Seab May 28 '22 at 03:31
  • is the speed normal if you use the wired connection? what is the signal level and link quality,you can use the terminal program wavemon to see this and what speeds up/down do wavemon show? – trond hansen May 28 '22 at 04:03
  • Read my answer to https://askubuntu.com/questions/1353705/ubuntu-20-04-wifi-keeps-dropping/1353723#1353723 it explains why WiFi is "slow" (packet fragmenting) and what to do. AskUbuntu doesn't want duplicate answers – waltinator May 30 '22 at 21:00

1 Answers1

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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.

Eli
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