在我的系统(ubuntu 18.04(中运行sudo apt-get-update命令时，我遇到了以下错误，也无法安装任何新的应用程序：-
$ sudo apt-get update
Hit:1 http://repo.mysql.com/apt/ubuntu bionic InRelease
Hit:2 http://linux.teamviewer.com/deb stable InRelease
Ign:3 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 InRelease
Hit:4 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 Release
Get:5 http://sfo1.mirrors.digitalocean.com/mariadb/repo/10.2/debian jessie InRelease [3,263 B]
Ign:6 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:7 https://repo.skype.com/deb stable InRelease
Hit:9 http://ppa.launchpad.net/flexiondotorg/hal-flash/ubuntu bionic InRelease
Ign:11 http://extras.ubuntu.com/ubuntu trusty InRelease
Hit:12 http://security.ubuntu.com/ubuntu trusty-security InRelease
Ign:13 http://archive.ubuntu.com/ubuntu artful InRelease
Ign:14 http://archive.canonical.com/ubuntu trusty InRelease
Err:5 http://sfo1.mirrors.digitalocean.com/mariadb/repo/10.2/debian jessie InRelease
The following signatures were invalid: 199369E5404BD5FC7D2FE43BCBCB082A1BB943DB
Hit:15 http://dl.google.com/linux/chrome/deb stable Release
Hit:17 http://ppa.launchpad.net/linuxuprising/java/ubuntu bionic InRelease
Get:18 http://extras.ubuntu.com/ubuntu trusty Release [11.9 kB]
Hit:19 http://archive.canonical.com/ubuntu trusty Release
Ign:20 http://archive.ubuntu.com/ubuntu artful-updates InRelease
Get:22 http://extras.ubuntu.com/ubuntu trusty Release.gpg [72 B]
Ign:23 http://archive.ubuntu.com/ubuntu artful-security InRelease
Hit:25 http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu bionic InRelease
Hit:8 https://downloads.mariadb.com/MariaDB/mariadb-10.3/repo/ubuntu bionic InRelease
Ign:26 http://archive.ubuntu.com/ubuntu artful-backports InRelease
Hit:28 http://archive.ubuntu.com/ubuntu bionic InRelease
Ign:29 https://dl.bintray.com/rabbitmq/debian bionic InRelease
Ign:22 http://extras.ubuntu.com/ubuntu trusty Release.gpg
Err:21 http://www.getdeb.net/ubuntu xenial-getdeb InRelease
403 Forbidden [IP: 143.95.32.90 80]
Ign:30 http://ppa.launchpad.net/ondrej/mysql-5.6/ubuntu bionic InRelease
Ign:31 http://archive.ubuntu.com/ubuntu trusty InRelease
Get:32 https://dl.bintray.com/rabbitmq/debian bionic Release [74.5 kB]
Hit:33 http://archive.ubuntu.com/ubuntu trusty-updates InRelease
Hit:16 https://downloads.mariadb.com/Tools/ubuntu bionic InRelease
Hit:34 http://archive.ubuntu.com/ubuntu trusty-backports InRelease
Hit:35 http://ppa.launchpad.net/ondrej/php/ubuntu bionic InRelease
Hit:36 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:37 http://ppa.launchpad.net/openjdk-r/ppa/ubuntu bionic InRelease
Err:38 http://archive.ubuntu.com/ubuntu artful Release
404 Not Found [IP: 2001:67c:1360:8001::23 80]
Err:39 http://archive.ubuntu.com/ubuntu artful-updates Release
404 Not Found [IP: 2001:67c:1360:8001::23 80]
Err:40 http://archive.ubuntu.com/ubuntu artful-security Release
404 Not Found [IP: 2001:67c:1360:8001::23 80]
Hit:41 http://ppa.launchpad.net/phpmyadmin/ppa/ubuntu bionic InRelease
Err:43 http://archive.ubuntu.com/ubuntu artful-backports Release
404 Not Found [IP: 2001:67c:1360:8001::23 80]
Hit:44 http://archive.ubuntu.com/ubuntu trusty Release
Ign:45 http://ppa.launchpad.net/pmiller-opensource/ppa/ubuntu bionic InRelease
Hit:46 http://ppa.launchpad.net/umang/indicator-stickynotes/ubuntu bionic InRelease
Hit:48 http://ppa.launchpad.net/webupd8team/java/ubuntu bionic InRelease
Err:49 http://ppa.launchpad.net/ondrej/mysql-5.6/ubuntu bionic Release
404 Not Found [IP: 2001:67c:1560:8008::15 80]
Err:50 http://ppa.launchpad.net/pmiller-opensource/ppa/ubuntu bionic Release
404 Not Found [IP: 2001:67c:1560:8008::15 80]
Reading package lists... Done
W: GPG error: http://sfo1.mirrors.digitalocean.com/mariadb/repo/10.2/debian jessie InRelease: The following signatures were invalid: 199369E5404BD5FC7D2FE43BCBCB082A1BB943DB
E: The repository 'http://sfo1.mirrors.digitalocean.com/mariadb/repo/10.2/debian jessie InRelease' is not signed.
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.
W: GPG error: http://extras.ubuntu.com/ubuntu trusty Release: The following signatures were invalid: C47415DFF48C09645B78609416126D3A3E5C1192
E: The repository 'http://extras.ubuntu.com/ubuntu trusty Release' is not signed.
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: Failed to fetch http://archive.getdeb.net/ubuntu/dists/xenial-getdeb/InRelease 403 Forbidden [IP: 143.95.32.90 80]
E: The repository 'http://archive.getdeb.net/ubuntu xenial-getdeb InRelease' is not signed.
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.
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'http://downloads.mariadb.com/MariaDB/mariadb-10.3/repo/ubuntu bionic InRelease' doesn't support architecture 'i386'
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'http://downloads.mariadb.com/Tools/ubuntu bionic InRelease' doesn't support architecture 'i386'
E: The repository 'http://archive.ubuntu.com/ubuntu artful 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://archive.ubuntu.com/ubuntu artful-updates 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://archive.ubuntu.com/ubuntu artful-security 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://archive.ubuntu.com/ubuntu artful-backports 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.
W: Target Packages (universe/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target Packages (universe/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target Packages (universe/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target Translations (universe/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target Translations (universe/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target DEP-11 (universe/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target DEP-11 (universe/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target DEP-11-icons-small (universe/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target DEP-11-icons (universe/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target CNF (universe/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target CNF (universe/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
E: The repository 'http://ppa.launchpad.net/ondrej/mysql-5.6/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/pmiller-opensource/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.
W: Target Packages (universe/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target Packages (universe/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target Packages (universe/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target Translations (universe/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target Translations (universe/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target DEP-11 (universe/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target DEP-11 (universe/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target DEP-11-icons-small (universe/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target DEP-11-icons (universe/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target CNF (universe/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
W: Target CNF (universe/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:6 and /etc/apt/sources.list:12
请建议解决此问题所需执行的步骤。
在我的系统(ubuntu 18.04(中运行sudo apt-get-update命令时出现这些错误，也无法安装任何新的应用程序。
这是因为您添加了大量的PPA！
尝试从/etc/apt/sources.list.d/和/etc/apt/sources.list中删除所有这些PPA，然后再次运行sudo apt update，然后一切都应该正常。(如果您想要/etc/apt/sources.list，请查看此链接(
我应该提到的是，添加这么多PPA是有风险的，你应该尽量避免！(除非必要，请确保您添加了一个安全的ppa。(
尝试ping它抱怨的资源，看看是否能够得到响应。
我试过了http://archive.ubuntu.com/ubuntu并且可以很好地解决它，所以它可能与防火墙或代理有关。