kamalakant@kamalakant-lenovo:~$ sudo apt update
Ign:1 http://ppa.launchpad.net/asukhovatkin/unity-launcher-folders/ubuntu xenial InRelease
Hit:2 http://archive.canonical.com/ubuntu xenial InRelease                     
Hit:3 http://in.archive.ubuntu.com/ubuntu xenial InRelease                     
Get:4 http://security.ubuntu.com/ubuntu xenial-security InRelease [94.5 kB]    
Get:5 http://ppa.launchpad.net/atareao/atareao/ubuntu xenial InRelease [17.5 kB]
Hit:6 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease             
Hit:7 http://in.archive.ubuntu.com/ubuntu xenial-backports InRelease           
Hit:8 http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu xenial InRelease         
Hit:9 http://ppa.launchpad.net/wine/wine-builds/ubuntu xenial InRelease        
Err:10 http://ppa.launchpad.net/asukhovatkin/unity-launcher-folders/ubuntu xenial Release
  404  Not Found
Reading package lists... Done                             
E: The repository 'http://ppa.launchpad.net/asukhovatkin/unity-launcher-folders/ubuntu xenial Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
kamalakant@kamalakant-lenovo:~$