I'm trying to install the gdebi.deb package on my computer. I need to do it manually through the terminal, but I have tried the sudo install -I package.deb but says it doesn't work because it's not a directory or something. Then I did cd /home/user/downloads/package.deb and when it changed directories I did sudo install -I package.deb but the same thing came up. I've already downloaded gdebi.deb in my downloads but need to install it through the terminal.