I am using Debian 8 jessie-backports, how can I install the package
libdrm2-dev? I tried
apt install libdrm2-dev/jessie-backports but I get:
E: Unable to locate package libdrm2-dev
You need to install
sudo apt install libdrm-dev/jessie-backports
I’m assuming you have updated your repository configuration for Jessie backports; see Failed to fetch jessie backports repository for details.