'''1.''' Open the Debian <code>sources.list</code> file using an editor with root rights.
{{CodeSelect|code=
sudo nano {{{filename}}}
}}
'''2.''' Reference the onionized Debian repositories.
Cut and paste the following <i>.onion</i> mirrors and comment out (#) the corresponding https repositories.
{{CodeSelect|code=
#deb
https://deb.debian.org/debian {{Stable project version based on Debian codename}} main contrib non-free
deb tor+http://{{Debian_onion}}/debian {{Stable project version based on Debian codename}} main contrib non-free
#deb
https://deb.debian.org/debian-security {{Stable project version based on Debian codename}}-security main contrib non-free
deb tor+http://{{security.debian.org_onion}} {{Stable project version based on Debian codename}}-security main contrib non-free
#Optional Backports
#deb
https://deb.debian.org/debian {{Stable project version based on Debian codename}}-backports main contrib non-free
deb tor+http://{{Debian_onion}}/debian {{Stable project version based on Debian codename}}-backports main contrib non-free
}}
Save and exit.
'''3.''' Confirm the onionized repositories are functional.
{{CodeSelect|code=
sudo apt update && sudo apt full-upgrade
}}