$ sudo apt update
Hit:1 http://archive.canonical.com/ubuntu xenial InRelease
Hit:2 http://ppa.launchpad.net/kritalime/ppa/ubuntu xenial InRelease           
Get:3 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]     
Hit:4 http://us.archive.ubuntu.com/ubuntu xenial InRelease                     
Get:5 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]    
Get:6 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]  
Fetched 306 kB in 8s (37.8 kB/s)                                               
Reading package lists... Done
Building dependency tree       
Reading state information... Done
251 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list.d/kritalime-ubuntu-ppa-xenial.list:2 and /etc/apt/sources.list.d/kritalime-ubuntu-ppa-xenial.list:3
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list.d/kritalime-ubuntu-ppa-xenial.list:2 and /etc/apt/sources.list.d/kritalime-ubuntu-ppa-xenial.list:3