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I have a dual boot system in separate disks ( windows 10 & Ubuntu 17.10 ). My wireless adapter is TP-LINK WN822N. When I use Windows 10, Internet speed is about 2.8Mbps. But with Ubuntu, speed falls to 0.8Mbps. According to
My wireless/WiFi connection does not work. What information is needed to diagnose the issue?
I have created
https://pastebin.com/uHS5ufFx
to give a full detailed report of my Network. I appreciate any help

EDIT As Tomáš Pospíšek asked:

 tracepath askubuntu.com
 1?: [LOCALHOST]                      pmtu 1500
 1:  speedport-entry-2i.ote.gr                            16.350ms 
 1:  speedport-entry-2i.ote.gr                            16.196ms 
 2:  speedport-entry-2i.ote.gr                            15.809ms pmtu 1492
 2:  80.106.108.1                                         35.786ms asymm  3 
 3:  maro7609a-bras-mar4-e320.backbone.otenet.net         36.435ms 
 4:  nyma-asr99a-maro7609a.backbone.otenet.net            36.507ms 
 5:  62.75.3.157                                          37.052ms asymm  7 
 6:  62.75.6.34                                           86.912ms asymm  7 
 7:  ffm-b10-link.telia.net                               88.176ms asymm 12 
 8:  ffm-bb3-link.telia.net                              110.541ms asymm 11 
 9:  ffm-b1-link.telia.net                                87.875ms asymm 12 
10:  no reply
11:  no reply
............
30:  no reply
     Too many hops: pmtu 1492
     Resume: pmtu 1492
fenia
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  • Your MTU value is too large (1500) - it should be smaller, e.g. 1492. Install and run tracepath to check your MTU. – waltinator Mar 03 '18 at 18:32
  • Thanks waltinator for reply. "tracepath 192.168.1.10 1: home 0.065ms reached Resume: pmtu 65535 hops 1 back 1" – fenia Mar 03 '18 at 19:02
  • could you tracepath out of your LAN (tracepath askubuntu.com). 2. could you insert the command and output nicely formatted into your question?
    • – Tomáš Pospíšek Mar 03 '18 at 22:34