Hello, I tried to install indicator-brightness, but got errors : master@master-laptop:/mnt/_work_sdb8/wwwroot/lar/Hostels4J$ sudo add-apt-repository ppa:indicator-brightness/ppa [sudo] password for master: PPA for the indicator-brightness for the Unity panel. More info: https://launchpad.net/~indicator-brightness/+archive/ubuntu/ppa Press [ENTER] to continue or Ctrl-c to cancel adding it. Hit:1 http://ua.archive.ubuntu.com/ubuntu focal InRelease Hit:2 http://ua.archive.ubuntu.com/ubuntu focal-updates InRelease Hit:3 http://ua.archive.ubuntu.com/ubuntu focal-backports InRelease Hit:4 http://dl.google.com/linux/chrome/deb stable InRelease Hit:5 http://ppa.launchpad.net/giuspen/ppa/ubuntu focal InRelease Hit:6 https://deb.nodesource.com/node_14.x focal InRelease Ign:7 http://ppa.launchpad.net/indicator-brightness/ppa/ubuntu focal InRelease Hit:8 http://security.ubuntu.com/ubuntu focal-security InRelease Hit:9 http://ppa.launchpad.net/ondrej/php/ubuntu focal InRelease Err:10 http://ppa.launchpad.net/indicator-brightness/ppa/ubuntu focal Release 404 Not Found [IP: 91.189.95.85 80] Reading package lists... Done E: The repository 'http://ppa.launchpad.net/indicator-brightness/ppa/ubuntu focal 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. master@master-laptop:/mnt/_work_sdb8/wwwroot/lar/Hostels4J$ sudo apt-get update Hit:1 http://ua.archive.ubuntu.com/ubuntu focal InRelease Hit:2 http://ua.archive.ubuntu.com/ubuntu focal-updates InRelease Hit:3 http://ua.archive.ubuntu.com/ubuntu focal-backports InRelease Hit:4 http://dl.google.com/linux/chrome/deb stable InRelease Hit:5 http://ppa.launchpad.net/giuspen/ppa/ubuntu focal InRelease Hit:6 https://deb.nodesource.com/node_14.x focal InRelease Ign:7 http://ppa.launchpad.net/indicator-brightness/ppa/ubuntu focal InRelease Hit:8 http://security.ubuntu.com/ubuntu focal-security InRelease Hit:9 http://ppa.launchpad.net/ondrej/php/ubuntu focal InRelease Err:10 http://ppa.launchpad.net/indicator-brightness/ppa/ubuntu focal Release 404 Not Found [IP: 91.189.95.85 80] Reading package lists... Done E: The repository 'http://ppa.launchpad.net/indicator-brightness/ppa/ubuntu focal 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. master@master-laptop:/mnt/_work_sdb8/wwwroot/lar/Hostels4J$ sudo apt-get install indicator-brightness Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package indicator-brightness Code (markup): Searching in next I found additive option : --allow-unauthenticated Code (markup): but looks lokie this option does not work now ? Which is good and safe way to inmstall indicator-brightness ? Thanks!
I failed to install indicator-brightness anyway. 1) How can I clear indicator-brightness from my repository, as : I tried to add docker support with command : sudo vi /etc/apt/sources.list.d/docker.list Code (markup): New file docker.list was created. I deleted it manually , but I still got errors : root@master-laptop:/etc/apt/sources.list.d# sudo add-apt-repository --remove ppa:indicator-brightnes Cannot add PPA: 'ppa:~indicator-brightnes/ubuntu/ppa'. ERROR: '~indicator-brightnes' user or team does not exist. root@master-laptop:/etc/apt/sources.list.d# sudo apt-get update Hit:1 http://ua.archive.ubuntu.com/ubuntu focal InRelease Hit:2 http://ua.archive.ubuntu.com/ubuntu focal-updates InRelease Hit:3 http://ua.archive.ubuntu.com/ubuntu focal-backports InRelease Hit:4 http://dl.google.com/linux/chrome/deb stable InRelease Hit:5 https://repo.skype.com/deb stable InRelease Hit:6 http://ppa.launchpad.net/giuspen/ppa/ubuntu focal InRelease Hit:7 http://ppa.launchpad.net/ondrej/php/ubuntu focal InRelease Hit:8 https://deb.nodesource.com/node_14.x focal InRelease Hit:9 http://security.ubuntu.com/ubuntu focal-security InRelease Reading package lists... Done E: The method driver /usr/lib/apt/methods/ppa could not be found. N: Is the package apt-transport-ppa installed? E: Failed to fetch ppa://indicator-brightness/ppa/dists/master/InRelease Code (markup): 2) I use Kubuntu 20, so I search some KDE app/plugin/tool like indicator-brightnes compatible with Kubuntu 20...