netselect-apt is a script to create an apt sources.list file automatically by downloading the list of Debian mirrors and choosing the fastest.
Install netselect-apt
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$ sudo apt install netselect-apt
Run netselect-apt
We can choose our debian branch stable/testing/sid for the test
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$ sudo netselect-apt -s stable
At this point, netselect-apt will have generated a sources.list file for the fastest mirror available on the directory where we have executed it.
We can now substitute our /etc/apt/sources.list by the sources.list generated by netselect-apt or we can edit our /etc/apt/sources.list and sustitute the mirrors by the chosen ones by netselect-apt.
I always recommend to backup /etc/apt/sources.list before making changes.
Enjoy! ;)