In Ubuntu linux on the campus network, the Cert Certification finally settled the problem one afternoon. in Ubuntu Linux on the virtual machine, the Cert Certification was used to access the Internet. Because no tutorial can be found during the process, I decided to write a blog and share it. First, I used aecium.tar.gz for installation. First, decompress and compile tar-zxvf aecium.tar.gz cd aecium sudo mkdir/usr/local/aecium. /configure -- prefix =/usr/local/aecium make and switch to the installation directory cd/usr/local/aecium to run. /aecium -- help ~ /. Aecium file ~ /. The content of the aecium file is host = your school-certified server. After logging on to windows, you can see service = int (which means internet) interface = eth0 (which depends on which network card you use to log on, eth0) after the file is created, if you want to set the network connection mode to bridging under the virtual machine, then enter it under the command line (in the/usr/local/aecium directory ). /aecium-u account-p Password enter OK ~ After I press enter, the invalid package size is displayed! I think this is an error message, but I can access the internet. Now I write blogs under ubuntu. But to be honest, the anteng in linux is really unstable... frequent disconnection. Once a disconnection occurs, it is executed on the terminal. the/aecium-u account-p password is just written here to share with you, I hope to help you.