Installing SQL Server, I get unmet dependencies libc++1 and libjemalloc1 but it is not installable
This is because both of those packages are in the Ubuntu Universe, to enable that repository you can use,

sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) universe"


Note that the Universe Packages are not Officially Supported by Canonical and the Ubuntu Team, but instead by the community. For more information see the Security FAQ