How to change mirror sg.archive.ubuntu.com to vn.archive.ubuntu.com on ubuntu

To change the mirror from sg.archive.ubuntu.com to vn.archive.ubuntu.com on Ubuntu, follow these steps:

Step 1: Open the `sources.list` file

In a terminal, open the `sources.list` file using a text editor:

sudo nano /etc/apt/sources.list

Step 2: Find and replace `sg.archive.ubuntu.com` with `vn.archive.ubuntu.com`

Inside `sources.list`, locate any lines containing `sg.archive.ubuntu.com` and replace them with `vn.archive.ubuntu.com`.

Alternatively, you can use the `sed` command to perform this replacement automatically:

sudo sed -i 's|sg.archive.ubuntu.com|vn.archive.ubuntu.com|g' /etc/apt/sources.list

Step 3: Update the package list

Once you've saved the changes, refresh the package list to use the new mirror:

sudo apt update

Now, Ubuntu will use vn.archive.ubuntu.com as the primary mirror.