i am trying to install claws-mail on ubuntu 19.04. while running this command i get the below error. could anyone suggest on why am i getting this? what should be done to resolve this?
$ sudo add-apt-repository ppa:ubuntuhandbook1/claws-mail
[sudo] password for <user>:
More info: https://launchpad.net/~ubuntuhandbook1/+archive/ubuntu/claws-mail
Press [ENTER] to continue or Ctrl-c to cancel adding it.
Hit:1 http://us.archive.ubuntu.com/ubuntu disco InRelease
Hit:2 http://packages.microsoft.com/repos/vscode stable InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu disco-updates InRelease
Hit:4 http://us.archive.ubuntu.com/ubuntu disco-backports InRelease
Hit:5 http://us.archive.ubuntu.com/ubuntu disco-security InRelease
Hit:6 https://packagecloud.io/AtomEditor/atom/any any InRelease
Ign:8 http://ppa.launchpad.net/ubuntuhandbook1/claws-mail/ubuntu disco InRelease
Hit:7 https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease
Hit:9 http://ppa.launchpad.net/webupd8team/terminix/ubuntu disco InRelease
Err:10 http://ppa.launchpad.net/ubuntuhandbook1/claws-mail/ubuntu disco Release
404 Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/ubuntuhandbook1/claws-mail/ubuntu disco 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.
trying to follow these commands to install.
sudo add-apt-repository ppa:ubuntuhandbook1/claws-mail
sudo apt update
sudo apt install claws-mail
