I'm trying Ubuntu 17.10 on a VM. I wanted to install penguin subtitle player (which I already have on my Ubuntu 16.04 host) on the VM. I followed the steps explained on the repo page on github.
First I added the PPA
sudo add-apt-repository ppa:nilarimogard/webupd8
then I ran
sudo apt update sudo apt install penguin-subtitle-player
but I got the error
E: Unable to locate package penguin-subtitle-player