我收到此错误，不知道如何解决此问题：
更新您的软件包信息后，找不到必要的软件包“ubuntu-minimal”。这可能是因为您的软件源中没有列出官方镜像，或者您使用的镜像负载过大。有关已配置软件源的当前列表，请参阅 /etc/apt/sources.list。在镜像过载的情况下，您可能希望稍后再次尝试升级。
任何人都可以请建议我需要做什么。
我在https://askubuntu.com/questions/124017/how-do-i-restore-the-default-repositories/etc/apt/sources.list的帮助下重建了我的。我的 resources.list 有一些我自定义的和 Linode 镜像。我刚刚用https://repogen.simplylinux.ch的输出替换了sources.list 。我再次运行升级，成功了。
我的 resources.list 中的示例失败了
## Major bug fix updates produced after the final release of the
## distribution. deb http://mirrors.linode.com/ubuntu/ xenial-updates main restricted
# deb-src http://mirrors.linode.com/ubuntu/ xenial-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://mirrors.linode.com/ubuntu/ xenial universe
# deb-src http://mirrors.linode.com/ubuntu/ xenial universe deb
http://mirrors.linode.com/ubuntu/ xenial-updates universe
# deb-src http://mirrors.linode.com/ubuntu/ xenial-updates universe
https://repogen.simplylinux.ch的输出有效
#------------------------------------------------------------------------------#
# OFFICIAL UBUNTU REPOS #
#------------------------------------------------------------------------------#
###### Ubuntu Main Repos
deb http://us.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
###### Ubuntu Update Repos
deb http://us.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse
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