Ubuntu 14.04(在linode上)没有做“do-release-upgrade”

我收到此错误,不知道如何解决问题:

After updating your package information,the essential package
‘ubuntu-minimal’ Could not be located. This may be because you have
no official mirrors listed in your software sources,or because of
excessive load on the mirror you are using. See /etc/apt/sources.list
for the current list of configured software sources.
In the case of an overloaded mirror,you may want to try the upgrade
again later.

任何人都可以告诉我需要做什么.

我在 https://askubuntu.com/questions/124017/how-do-i-restore-the-default-repositories的帮助下重建了我的/etc/apt/sources.list.我的sources.list有一些自定义的和Linode镜像.我刚刚用 https://repogen.simplylinux.ch输出替换了我的sources.list.我再次运行升级并且成功了.

来自我的sources.list失败的例子

## 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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