After building a custom kernel Debian in pursuit of reducing audio latency in Ardour, I was left with a .dsc file which I didn't know how to install. Copying here the instructions I found on StackOverflow for future reference.
Full procedure to install the package related to a .dsc file: Before you begin, note that, besides the .dsc file, you must have the corresponding xxx-orig.tar.xz and xxx-debian.tar.xz files. Install dpkg-dev package, if not present in your linux machine sudo apt-get install dpkg-dev Following command extracts the package into an automatically created directory. Note: the necessary xxx-orig.tar.xz and xxx-debian.tar.xz files must be in the same directory as the .dsc file in order to work properly. dpkg-source -x yourfile.dsc If you get error message concerning the signature, check this post here. To build the package get into the directory that was created in 2nd step and issue this command dpkg-buildpackage -rfakeroot -b To install the built package issue this command dpkg -i ../yourfile_arch.deb