Ubuntu18.04 问题——无法安全地用该源进行更新，所以默认禁用该源。404 NOT FOUND [IP.... ]不含有 'multiverse`' 组件[...]

解决办法：在etc/apt/sources.list.d 目录中删除对应的ppa(稳妥起见可以进行备份成.bak）
$ sudo mv /etc/apt/sources.list.d/ubuntukylin.list /etc/apt/sources.list.d/ubuntukylin.list.bak

然后执行：
sudo apt-get updat

如果任然有下载源错误执行：
$ sudo gedit /etc/apt/sources.list

将内容替换如下：

# 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://mirrors.cn99.com/ubuntu/ bionic main restricted
# deb-src http://cn.archive.ubuntu.com/ubuntu/ bionic main restricted## Major bug fix updates produced after the final release of the
## distribution.
deb http://mirrors.cn99.com/ubuntu/ bionic-updates main restricted
# deb-src http://cn.archive.ubuntu.com/ubuntu/ bionic-updates main restricted## N.B. software from this rep

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