Shutdown Properly
Open the file /etc/init.d/alsa-utils with the following command:
sudo gedit /etc/init.d/alsa-utils
The file opens in Gedit and around the line 353 you'll find the instruction "stop)". Below this instruction you should add these two instructions:
ifconfig wlan0 down
ifconfig eth0 down
So, the file should be this way:
stop)
ifconfig wlan0 down
ifconfig eth0 down
EXITSTATUS=0
After doing this, save the file, close it and restart or shutdown Ubuntu and verify if the problem continues.


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