«Файл версии еще не действителен» и другие ошибки при запуске обновления apt-get [дубликат]

Я использую Ubuntu 18.04 на Lenovo Legion Y520 (16 ГБ ОЗУ, процессор i7-7700HQ 7-го поколения). Когда я запускаю команду apt-get update , я получаю следующее:

$ sudo apt-get update
Hit:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease          
Ign:3 http://download.opensuse.org/repositories/home:/strycore/xUbuntu_18.04 ./ InRelease
Hit:4 http://ppa.launchpad.net/arx/release/ubuntu bionic InRelease                                                  
Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB]                                         
Hit:6 http://download.opensuse.org/repositories/home:/strycore/xUbuntu_18.04 ./ Release                                                                    
Hit:8 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu bionic InRelease                                                                                
Get:5 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [83.2 kB]                                                          
Ign:10 http://ppa.launchpad.net/gregory-hainaut/pcsx2.official.ppa/ubuntu bionic InRelease                                                       
Ign:11 http://ppa.launchpad.net/jd-team/jdownloader/ubuntu bionic InRelease                                     
Get:7 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Hit:12 http://ppa.launchpad.net/libretro/stable/ubuntu bionic InRelease                                        
Ign:13 http://ppa.launchpad.net/micove/console/ubuntu bionic InRelease
Hit:14 http://ppa.launchpad.net/minetestdevs/stable/ubuntu bionic InRelease    
Hit:15 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu bionic InRelease   
Ign:16 http://ppa.launchpad.net/noobslab/apps/ubuntu bionic InRelease          
Hit:18 http://ppa.launchpad.net/persepolis/ppa/ubuntu bionic InRelease         
Hit:19 http://ppa.launchpad.net/webupd8team/java/ubuntu bionic InRelease       
Err:20 http://ppa.launchpad.net/gregory-hainaut/pcsx2.official.ppa/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Err:21 http://ppa.launchpad.net/jd-team/jdownloader/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Err:22 http://ppa.launchpad.net/micove/console/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Err:23 http://ppa.launchpad.net/noobslab/apps/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Get:17 http://ppa.launchpad.net/pcsx2-team/pcsx2-daily/ubuntu bionic InRelease [15.9 kB]
Reading package lists... Done     
E: Release file for http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease is not valid yet (invalid for another 2h 38min 48s). Updates for this repository will not be applied.
E: Release file for http://us.archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease is not valid yet (invalid for another 2h 38min 53s). Updates for this repository will not be applied.
E: Release file for http://us.archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease is not valid yet (invalid for another 2h 39min 9s). Updates for this repository will not be applied.
E: The repository 'http://ppa.launchpad.net/gregory-hainaut/pcsx2.official.ppa/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/jd-team/jdownloader/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/micove/console/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/noobslab/apps/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: Release file for http://ppa.launchpad.net/pcsx2-team/pcsx2-daily/ubuntu/dists/bionic/InRelease is not valid yet (invalid for another 3h 41min 24s). Updates for this repository will not be applied.

Дело в том, что всякий раз, когда я недавно пытаюсь добавить репозиторий, я получаю ту же ошибку: файл выпуска недействителен, и что обновление из такого репозитория не может быть выполнено безопасно. Сначала я думал, что репозиторий / программа устарели, но даже популярные программы, такие как Retroarch, выдают ту же ошибку. Я пробовал как минимум 5 разных, все равно.

Вот мой sources.list :

# deb cdrom:[Ubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426)]/ bionic main restricted

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

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

На прошлой неделе я искал решение, но не нашел. Пожалуйста, сделайте свой ответ как можно более дружественным к новичкам, я все еще учусь.

Большое спасибо!