i was trying sudo apt-get update but instead it showed following error
sudo apt-get update


Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Ign:2 http://ppa.launchpad.net/mc3man/xerus-media/ubuntu hirsute InRelease
Hit:3 https://repo.skype.com/deb stable InRelease
Ign:4 http://ppa.launchpad.net/noobslab/apps/ubuntu groovy InRelease
Ign:5 http://ppa.launchpad.net/rock-core/qt4/ubuntu hirsute InRelease
Ign:7 http://ppa.launchpad.net/teejee2008/ppa/ubuntu hirsute InRelease
Ign:8 http://ppa.launchpad.net/webupd8team/java/ubuntu groovy InRelease
Err:9 http://ppa.launchpad.net/mc3man/xerus-media/ubuntu hirsute Release
404 Not Found [IP: 91.189.95.85 80]
Get:6 http://ftp.harukasan.org/kali kali-rolling InRelease [30.5 kB]
Err:10 http://ppa.launchpad.net/noobslab/apps/ubuntu groovy Release
404 Not Found [IP: 91.189.95.85 80]
Err:11 http://ppa.launchpad.net/rock-core/qt4/ubuntu hirsute Release
404 Not Found [IP: 91.189.95.85 80]
Ign:12 http://download.virtualbox.org/virtualbox/debian kali-rolling InRelease
Err:13 http://ppa.launchpad.net/teejee2008/ppa/ubuntu hirsute Release
404 Not Found [IP: 91.189.95.85 80]
Err:14 http://ppa.launchpad.net/webupd8team/java/ubuntu groovy Release
404 Not Found [IP: 91.189.95.85 80]
Hit:15 https://deb.torproject.org/torproject.org stretch InRelease
Err:16 http://download.virtualbox.org/virtualbox/debian kali-rolling Release
404 Not Found [IP: 49.44.160.20 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/mc3man/xerus-media/ubuntu hirsute 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.
E: The repository 'http://ppa.launchpad.net/noobslab/apps/ubuntu groovy 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.
E: The repository 'http://ppa.launchpad.net/rock-core/qt4/ubuntu hirsute 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.
E: The repository 'http://ppa.launchpad.net/teejee2008/ppa/ubuntu hirsute 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.
E: The repository 'http://ppa.launchpad.net/webupd8team/java/ubuntu groovy 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.
E: The repository 'http://download.virtualbox.org/virtualbox/debian kali-rolling 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.


Please help me to solve this issue..
Thanks in Advance