These instructions are for installing the Ravencoin wallet on Fedeora, but the instructions should work for CentOS, and be similar for Debian/Ubuntu Distros.
The Linux readme can be found here.
sudo dnf -y install zeromq libevent boost libdb4 miniupnpc libdb4-cxx protobuf-lite-devel
Download the binaries. Manually here or with wget. Latest files should be on their github https://github.com/RavenProject/Ravencoin/releases/latest
Note if you don’t have wget installed, you can install it by running
sudo dnf install -y wget
Unzip the downloaded files
tar zxvf fedora27-x86_64.tar.gz
Change to the new directory
Launch the Raven Wallet GUI