I need to install build-dependencies of something, how do I ensure the source code section of my software sources is enabled?
Launch the software center and select software sources:
In the software sources make sure "Source Code" is checked:
The default archive repositories have the source archives enabled as well as the binaries. Also, adding any PPAs with
sudo add-apt-repository ppa:user/archive should enable the source and binary archives both.
To verify, you can check in the
/etc/apt/sources.list file, and in the files in
/etc/apt/sources.list.d/, to ensure the
deb-src lines for each
deb archive line, are there. Also, in the
Software Sources properties dialog, you can check that the
Source code option is checked on the
Ubuntu Software tab, and that there are corresponding
Source entries for the
Binaries entries, in the list of additional sources under the
Other Software tab.
You can enable source code repositories by uncommenting (removing
deb-src repositories from
sed -i '/deb-src/s/^# //' /etc/apt/sources.list && apt update
If you want to disable source code repositories, you can comment it back
sed -i '/deb-src/s/^/# /' /etc/apt/sources.list && apt update