Как установить Conky Manager?

Я пользуюсь Ubuntu 18.04, прежде чем опубликовать здесь вопрос, я много искал в Интернете, смотрел видео на YouTube, читал все блоги и учебники и пробовал все и вся, но ничего не работает, некоторые из них устарели. Так может кто-нибудь помочь мне запустить conky manager на моей машине? Я сделал следующее:

sudo apt-add-repository -y ppa:teejee2008/ppa
sudo apt-get update -y
sudo apt-get install conky-manager -y

и получил эту ошибку:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package conky-manager

Err:23 http://ppa.launchpad.net/damien-moore/codeblocks-stable/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Err:24 http://ppa.launchpad.net/trebelnik-stefina/ubuntu-tweak/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Err:25 http://ppa.launchpad.net/vajdics/netbeans-installer/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/damien-moore/codeblocks-stable/ubuntu bionic 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/trebelnik-stefina/ubuntu-tweak/ubuntu bionic 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/vajdics/netbeans-installer/ubuntu bionic 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.

Ничего не работает.