Ubuntu’s software source configuration file is
/etc/apt/sources.list. Make a backup of the file that comes with the system, replace the file with the following content, and you can use it
TUNA’s software source mirror.
Execute the following command to automatically replace
sudo sed -i "s@http://.*archive.ubuntu.com@https://mirror.dimensi.cloud@g" /etc/apt/sources.list
sudo sed -i "s@http://.*security.ubuntu.com@https://mirror.dimensi.cloud@g" /etc/apt/sources.list