{{mbox
| image   = [[File:Ambox_warning_pn.svg.png|40px]]
| text    = Prior to installing [https://packages.debian.org/{{Debian_Codename_Unstable}}/{{{package}}} <code>{{{package}}}</code>] from Debian <code>unstable</code>, read [[Install_Software#Install_from_Debian_unstable|Install software from Debian unstable]] to understand the risks involved and circumvention options. Mixing packages from Debian <code>stable</code> with later release packages like Debian <code>unstable</code> can lead to [[Install_Software#Dependency_Hell|instability]]. <ref>It is recommended to create multiple {{project_name_short}} to install the package due to these risks.</ref>
}}
{{Box|text=
{{IconSet|h2|1}} {{Open_a__product_ws_terminal}}

{{IconSet|h2|2}} In {{project_name_workstation_long}} (<code>{{project_name_workstation_template}}</code> [[Qubes|{{qubes_project_name}}]]) terminal, add Debian stable codename <code>{{Stable_project_version_based_on_Debian_codename}}</code> to the <code>apt-conf</code> <i>default-release</i>.

{{CodeSelect|code=
sudo su -c "echo -e 'APT::Default-Release {{Stable_project_version_based_on_Debian_codename}};' > /etc/apt/apt.conf.d/70defaultrelease"
}}

{{IconSet|h2|3}} Add the current Debian unstable codename <code>{{Debian_Codename_Unstable}}</code> to <i>sources.list.d</i>.

{{CodeSelect|code=
sudo su -c "echo -e 'Types: deb
URIs: https://deb.debian.net/debian
Suites: {{Debian_Codename_Unstable}}
Components: main
Enabled: yes
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg' > /etc/apt/sources.list.d/unstable.sources"
}}

Or alternatively use the <i>.onion</i> mirror.

{{CodeSelect|code=
sudo su -c "echo -e 'Types: deb
URIs: tor+http://{{Debian_onion}}/debian
Suites: {{Debian_Codename_Unstable}}
Components: main
Enabled: yes
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg' > /etc/apt/sources.list.d/unstable.sources"
}}

{{IconSet|h2|4}} [[Operating_System_Software_and_Updates#Updates|Update]] the package lists.

{{CodeSelect|code=
sudo apt update
}}

{{IconSet|h2|5}} Install {{{package}}} from the current Debian unstable codename <code>{{Debian_Codename_Unstable}}</code> repository.

{{CodeSelect|code=
sudo apt install -t {{Debian_Codename_Unstable}} {{{package}}}
}}

{{IconSet|h2|6}} Undo.

On occasion it is necessary to undo this configuration, for example when upgrading from Debian <code>{{Stable_project_version_based_on_Debian_codename}}</code> to <code>{{Debian_Codename_Testing}}</code>. <ref>Most often this step applies before attempting major {{project_name_short}} upgrades; upgrade instructions are also made available at that time (see [[Stay_Tuned|stay tuned]]).</ref> To proceed, run.

Delete the Debian unstable repository list.

{{CodeSelect|code=
sudo rm /etc/apt/sources.list.d/unstable.sources
}}

Delete the <code>apt</code> Default-Release configuration.

{{CodeSelect|code=
sudo rm /etc/apt/apt.conf.d/70defaultrelease
}}
}}