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Recently I upgraded my Ubuntu machine from 14.04 to 16.04. At first my wifi was working fine, but after two days the system is not showing any wifi settings/connection. Can anyone please help me out this?

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No luck here, I tried to run the script but it gives an error. I am new to Ubuntu Ι don't know what this script does. Any help?

bakkireddy@bakkireddy-Z5WAH:~$ sudo systemctl restart network-manager.service 
[sudo] password for bakkireddy:
bakkireddy@bakkireddy-Z5WAH:~$ sudo systemctl restart network-manager.service #/etc/systemd/system/wifi-resume.service
bakkireddy@bakkireddy-Z5WAH:~$ #sudo systemctl enable wifi-resume.service
bakkireddy@bakkireddy-Z5WAH:~$ [Unit]
[Unit]: command not found
bakkireddy@bakkireddy-Z5WAH:~$ Description=Restart networkmanager at resume
networkmanager: command not found
bakkireddy@bakkireddy-Z5WAH:~$ After=suspend.target
bakkireddy@bakkireddy-Z5WAH:~$ After=hibernate.target
bakkireddy@bakkireddy-Z5WAH:~$ After=hybrid-sleep.target
bakkireddy@bakkireddy-Z5WAH:~$ 
bakkireddy@bakkireddy-Z5WAH:~$ [Service]
[Service]: command not found
bakkireddy@bakkireddy-Z5WAH:~$ Type=oneshot
bakkireddy@bakkireddy-Z5WAH:~$ ExecStart=/bin/systemctl restart network-manager.service
restart: Unknown job: network-manager.service
bakkireddy@bakkireddy-Z5WAH:~$
bakkireddy@bakkireddy-Z5WAH:~$ [Install]
[Install]: command not found
bakkireddy@bakkireddy-Z5WAH:~$ WantedBy=suspend.target
bakkireddy@bakkireddy-Z5WAH:~$ WantedBy=hibernate.target
bakkireddy@bakkireddy-Z5WAH:~$ WantedBy=hybrid-sleep.target
bakkireddy@bakkireddy-Z5WAH:~$ sudo systemctl enable wifi-resume.service
Failed to execute operation: No such file or directory

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