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I went to another place and my network(either wired or wi-fi) starts not working... For now, I have a workaround solution that every time I logged in I have to run sudo service network-manager start which give me the following information:

stop: Unknown instance: 
network-manager start/running, process 2410

Before I start network-manager, I ran status network-manager which give me this:

network-manager stop/waiting

Before I log in, I'm stuck here for around 1 and half minutes.. Here is a screenshot:


I Googled and found a workaround solution to change /etc/init/failsafe.conf, but since I didn't touch it before and my wifi works... there must be something wrong somewhere else...

BTW, this is my content of /etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp
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