'''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
}}