Table of contents
foreword
Opening my Ubuntu every day is like opening a blind box. You never know whether his network is working or not.
Internet problem
Sure enough, when I opened ubuntu today, there was no network logo again and again.
No matter how I change the network connection method of the network adapter, whether it is bridge mode or NAT mode, there is no network representation.
Cause Analysis:
Without even thinking about it, there must be no internet connection.
Ifconfig can only find the local loopback and
ping it will definitely not work
, neither ping domain name nor ping ip
solution:
Share a few effective methods
1 restart the network
1.1 Start the network service and enter the password
sudo systemctl start NetworkManager
1.2 Restart the network service
sudo systemctl restart NetworkManager
2 There may be a problem with Ubuntu's NetworkManager (80% of the problems are his)
2.1 Enter root and enter password
sudo su
2.2 Update the configuration of NetworkManager
You must have gedit or vim first, choose one of the two, gedit is used here, if you don’t have it, get gedit first, if you have it, go to the next step
apt-get install gedit
Open NetworkManager.conf with gedit
gedit /etc/NetworkManager/NetworkManager.conf
Change the fifth line from managed=False to managed=True, then ctrl+s to save and exit.
If it is True, there is no need to change it.
2.3 Delete NetworkManager configuration
service NetworkManager stop
rm /var/lib/NetworkManager/NetworkManager.state
service NetworkManager start
Pay attention to the status in the upper left corner of the desktop to automatically restore the network connection, and an icon will appear.
2.4 Restart to restore the network identity
3 VM settings
Change the network adapter in the vm from NAT mode to bridge mode, or from bridge mode to NAT mode.
Don't forget to restart the vm afterwards!
Summarize
I believe there is always one suitable for you, and my ubuntu is fine.
The network logo is also out.
