I installed Ubuntu 20.04.2 on my Dell machine Inspiron 3542. Previously on windows OS, the internet through wifi was very good.After I installed ubuntu, I found that download speed is very less, however, the upload speed is relatively good. 
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The kernel version installed in my machine is 5.8.0-53-generic.
I tried various solutions available and found that there does not exist a single solution. The solution I tried from the following link:
- Ubuntu 20.04 Network Performance Extremely Slow
- https://itsfoss.com/speed-up-slow-wifi-connection-ubuntu/#:~:text=The%20slow%20WiFi%20in%20Ubuntu,these%20Linux%20distributions%20as%20well.&text=Save%20it%2C%20close%20it%2C%20restart,wireless%20connection%20problem%20for%20you.
I tried following.
- Changed the power value from 2 to 3: No significant improvement. Download speed still pretty low < 4 megabits per second
- Enabling software-based encryption.
- Tried to remove: "sudo apt remove backport-iwlwifi-dkms": I got an error saying "Package 'backport-iwlwifi-dkms' is not installed, so not removed"
- Disable8802.11n
Nothing has worked for me. I think the problem is coming through the kernel. Has anyone faced the same problem. Requesting help.
