Err while updating

[senkukaxi]

Hi i'm a new user of kali linux ; i have the following err when i try the cmd sudo apt-get update :
E: The http://ppa.launchpad.net/brightbox/ruby-ng/ubuntu groovy Release repository does not have a Release file.
N: Updates from such a repository cannot be done securely, and are therefore disabled by default.
N: See the apt-secure (8) manual pages for creating repositories and user configuration details.
E: The http://ppa.launchpad.net/pi-rho/security/ubuntu groovy Release repository does not have a Release file.
N: Updates from such a repository cannot be done securely, and are therefore disabled by default.
N: See the apt-secure (8) manual pages for creating repositories and user configuration details.
please help

[microlabz]

I have almost the same problem HELP!!
E: The repository 'http://ppa.launchpad.net/webupd8team/y-ppa-manager/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.
W: GPG error: http://ppa.launchpad.net/webupd8team/java/ubuntu trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C2518248EEA14886