If you have one of the supported Linux distributions, you can follow the steps on the .NET Core website: https://www.microsoft.com/net

If you have an unsupported distribution:

Download the .NET Core SDK from the links, picking the distribution closer to the used one.

https://www.microsoft.com/net/download

If you have support for deb packages, you can install Ubuntu/Debian packages.

If you have support for yum packages, you can install Fedora packages.

Make sure your system has at least:

llvm-3.7.1-r3
libunwind-1.1-r1
icu-57.1
lttng-ust-2.8.1
openssl-1.0.2h-r2
curl-7.49.0