Failing to install in Ubuntu 18.10

I followed the installation instructions on but they didn’t work on my Ubuntu system:

$ sudo add-apt-repository ppa:lutris-team/lutris
 Stable releases for the Lutris client
 More info:
Press [ENTER] to continue or Ctrl-c to cancel adding it.

Hit:1 cosmic InRelease
Hit:2 cosmic-updates InRelease             
Hit:3 cosmic-backports InRelease           
Hit:4 stable InRelease                           
Get:5 cosmic InRelease [15.9 kB]
Hit:6 cosmic-security InRelease              
Hit:7 precise InRelease                     
Fetched 15.9 kB in 1s (26.4 kB/s)                  
Reading package lists... Done
$ sudo apt-get update
Hit:1 cosmic InRelease
Hit:2 precise InRelease                     
Hit:3 cosmic-updates InRelease             
Hit:4 cosmic-backports InRelease           
Hit:5 stable InRelease                           
Hit:6 cosmic-security InRelease              
Hit:7 cosmic InRelease
Reading package lists... Done
$ sudo apt-get install lutris
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package lutris

What am I missing? Any tips or pointers would be appreciated as I’m new to Linux and totally lost!

Did you try running apt-get update again or maybe restarting once? For me, it looks like everything you did was correct

I ran apt-get update several times and rebooted… no effect :[

What does apt-cache search lutris return?