J'ai essayé ces deux commandes et j'ai obtenu une erreur :
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sudo add-apt-repository ppa:flexiondotorg/albert
An amazing, desktop environment agnostic, omnilauncher. https://github.com/ManuelSchneid3r/albert More info: https://launchpad.net/~flexiondotorg/+archive/ubuntu/albert Press [ENTER] to continue or Ctrl-c to cancel adding it. Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease Hit:2 http://dl.google.com/linux/chrome/deb stable Release Hit:4 http://mirror.dhakacom.com/ubuntu-archive bionic InRelease Get:5 http://mirror.dhakacom.com/ubuntu-archive bionic-updates InRelease [88.7 kB] Ign:6 http://ppa.launchpad.net/flexiondotorg/albert/ubuntu bionic InRelease Get:7 http://mirror.dhakacom.com/ubuntu-archive bionic-backports InRelease [74.6 kB] Get:8 http://mirror.dhakacom.com/ubuntu-archive bionic-security InRelease [83.2 kB] Hit:9 http://ppa.launchpad.net/noobslab/apps/ubuntu bionic InRelease Hit:10 http://ppa.launchpad.net/notepadqq-team/notepadqq/ubuntu bionic InRelease Err:11 http://ppa.launchpad.net/flexiondotorg/albert/ubuntu bionic Release 404 Not Found [IP: 91.189.95.83 80] Hit:12 http://archive.canonical.com/ubuntu bionic InRelease Reading package lists... Done E: The repository 'http://ppa.launchpad.net/flexiondotorg/albert/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.
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sudo apt-get update && sudo apt-get install albert
Hit:1 http://mirror.dhakacom.com/ubuntu-archive bionic InRelease Get:2 http://mirror.dhakacom.com/ubuntu-archive bionic-updates InRelease [88.7 kB] Get:3 http://mirror.dhakacom.com/ubuntu-archive bionic-backports InRelease [74.6 kB] Get:4 http://mirror.dhakacom.com/ubuntu-archive bionic-security InRelease [83.2 kB] Ign:5 http://dl.google.com/linux/chrome/deb stable InRelease Hit:6 http://archive.canonical.com/ubuntu bionic InRelease Hit:7 http://dl.google.com/linux/chrome/deb stable Release Ign:9 http://ppa.launchpad.net/flexiondotorg/albert/ubuntu bionic InRelease Hit:10 http://ppa.launchpad.net/noobslab/apps/ubuntu bionic InRelease Hit:11 http://ppa.launchpad.net/notepadqq-team/notepadqq/ubuntu bionic InRelease Err:12 http://ppa.launchpad.net/flexiondotorg/albert/ubuntu bionic Release 404 Not Found [IP: 91.189.95.83 80] Reading package lists... Done E: The repository 'http://ppa.launchpad.net/flexiondotorg/albert/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.