method one:
Reference connection: https://www.cnblogs.com/dcpnet/p/9816360.html
Enter the following command:
$ sudo lshw -numeric -classnetwork
$ sudo ip addr show
$ sudo ip route show
$ sudo tracepath forum.ubuntu.org.cn
$ sudo apt-get install traceroute
$ sudo traceroute forum.ubuntu.org.cn
Method Two:
$ sudo vim /etc/modprobe.d/iwlwifi.conf
Add in the blank space in the opened configuration file:
options iwlwifi 11n_disable=1
ps: After personal testing, method one is effective, method two seems useless.
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