Ubuntu 18.04 apt-get update Errors [дубликат]

Я заметил, что некоторые из моих пакетов устарели, в то время как apt утверждает, что они находятся в последней версии . Когда я запустил apt-get update , я получил:

sudo apt-get update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://repository.spotify.com stable InRelease                      
Hit:3 http://archive.ubuntu.com/ubuntu bionic InRelease                   
Ign:4 http://ppa.launchpad.net/b-eltzner/qpdfview/ubuntu bionic InRelease 
Hit:5 http://archive.ubuntu.com/ubuntu bionic-updates InRelease           
Hit:6 http://dl.google.com/linux/chrome/deb stable Release                
Ign:7 http://ppa.launchpad.net/george-edison55/cmake-3.x/ubuntu bionic InRelease
Hit:8 http://archive.ubuntu.com/ubuntu bionic-backports InRelease         
Hit:9 https://packages.microsoft.com/repos/vscode stable InRelease        
Hit:10 http://archive.ubuntu.com/ubuntu bionic-security InRelease         
Ign:11 http://ppa.launchpad.net/libreoffice/libreoffice-4-2/ubuntu bionic InRelease
Hit:12 http://ppa.launchpad.net/libreoffice/ppa/ubuntu bionic InRelease
Hit:13 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu bionic InRelease
Ign:14 http://ppa.launchpad.net/tigerite/kernel/ubuntu bionic InRelease
Err:15 http://ppa.launchpad.net/b-eltzner/qpdfview/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Err:16 http://ppa.launchpad.net/george-edison55/cmake-3.x/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Err:17 http://ppa.launchpad.net/libreoffice/libreoffice-4-2/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Err:18 http://ppa.launchpad.net/tigerite/kernel/ubuntu bionic Release     
  404  Not Found [IP: 91.189.95.83 80]
Reading package lists... Done                                             
E: The repository 'http://ppa.launchpad.net/b-eltzner/qpdfview/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/george-edison55/cmake-3.x/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/libreoffice/libreoffice-4-2/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/tigerite/kernel/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.

Я попытался переключиться на разные источники, запустил - allow-unauthenticated и поставил [trusted = yes] перед всем в моем sources.list. Любые идеи? Мой файл sources.list:

# deb cdrom:[Ubuntu 18.04.1 LTS _Bionic Beaver_ - Release amd64 (20180725)]/ bionic main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu bionic main
deb-src http://archive.ubuntu.com/ubuntu bionic main
deb http://archive.ubuntu.com/ubuntu bionic restricted

# deb-src http://de.archive.ubuntu.com/ubuntu/ bionic main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu bionic-updates main restricted
# deb-src http://de.archive.ubuntu.com/ubuntu/ bionic-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu bionic universe
# deb-src http://de.archive.ubuntu.com/ubuntu/ bionic universe
deb http://archive.ubuntu.com/ubuntu bionic-updates universe
# deb-src http://de.archive.ubuntu.com/ubuntu/ bionic-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu bionic multiverse
# deb-src http://de.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://archive.ubuntu.com/ubuntu bionic-updates multiverse
# deb-src http://de.archive.ubuntu.com/ubuntu/ bionic-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb [trusted=yes] http://archive.ubuntu.com/ubuntu bionic-backports main restricted universe multiverse
# deb-src http://de.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu bionic partner
# deb-src http://archive.canonical.com/ubuntu bionic partner

deb http://archive.ubuntu.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://archive.ubuntu.com/ubuntu bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://archive.ubuntu.com/ubuntu bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse