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.
(paragraph 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 machinesudo apt-get install dpkg-devFollowing 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.dscIf you get error message concerning the signature, check (external-hyperlink (ref-text this post here) (external-url https://askubuntu.com/questions/56841/gpg-cant-check-signature#198420)) .To build the package get into the directory that was created in 2nd step and issue this commanddpkg-buildpackage -rfakeroot -bTo install the built package issue this commanddpkg -i ../yourfile_arch.deb)