我通过https://www.reddit.com/r/linux4noobs/comments/ducn4k/how_to_fix_404_not_found_ip_911899583_80/找到了一个解决方案，该解决方案是：

sudo add-apt-repository --remove ppa:vikoadi/ppa
sudo apt update

但是，而不是“ vokoadi”，请尝试“ webupd8team”（如无效的链接中所示：http://ppa.launchpad.net/webupd8team/java/ubuntu）：

sudo add-apt-repository --remove ppa:webupd8team/ppa
sudo apt update

我的问题（在下面列出）与“死蛇”有关，所以我不得不运行sudo add-apt-repository --remove ppa:deadsnakes/ppa：

Ign:5 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu eoan InRelease
Err:6 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu eoan Release
  404  Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/deadsnakes/ppa/ubuntu eoan 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.

在软件和更新应用程序中->其他软件。未检查 http://ppa.launchpad.net/webupd8team/java/ubuntu环境

我已经用下面的文字替换了 source.list，解决了我的问题。

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise main
deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise main


## Major bug fix updates produced after the final release of the
## distribution.
deb http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-updates main
deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-updates main


## 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-east-1.ec2.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise universe
deb http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-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-east-1.ec2.archive.ubuntu.com/ubuntu/ precise multiverse
# deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise multiverse
# deb http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-updates multiverse
# deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-updates multiverse


## Uncomment the following two lines to add software from the 'backports'
## repository.
## 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-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
# deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-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 precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner


deb http://security.ubuntu.com/ubuntu precise-security main
deb-src http://security.ubuntu.com/ubuntu precise-security main
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
# deb http://security.ubuntu.com/ubuntu precise-security multiverse
# deb-src http://security.ubuntu.com/ubuntu precise-security multiverse

然后运行这个

sudo apt update

在你的终端