我运行了do-release-upgrade该命令，在开始下载之前按下了 Ctrl+C。当我再次运行该命令时，它提到：
升级之前，请安装适合您的版本的所有可用更新。
我照做了（apt-get update，apt-get upgrade），但不久后意识到它正在更新到 Bionic。以下是
grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/*
> /etc/apt/sources.list:# deb cdrom:[Xubuntu 14.04 LTS _Trusty Tahr_ -
> Release amd64 (20140416.2)]/ trusty main multiverse restricted
> universe /etc/apt/sources.list: /etc/apt/sources.list:# See
> http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
> /etc/apt/sources.list:# newer versions of the distribution.
> /etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/ bionic
> main restricted /etc/apt/sources.list:deb-src
> http://us.archive.ubuntu.com/ubuntu/ bionic main restricted
> /etc/apt/sources.list: /etc/apt/sources.list:## Major bug fix updates
> produced after the final release of the /etc/apt/sources.list:##
> distribution. /etc/apt/sources.list:deb
> http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
> /etc/apt/sources.list:deb-src http://us.archive.ubuntu.com/ubuntu/
> bionic-updates main restricted /etc/apt/sources.list:
> /etc/apt/sources.list:## N.B. software from this repository is
> ENTIRELY UNSUPPORTED by the Ubuntu /etc/apt/sources.list:## team.
> Also, please note that software in universe WILL NOT receive any
> /etc/apt/sources.list:## review or updates from the Ubuntu security
> team. /etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/
> bionic universe /etc/apt/sources.list:deb-src
> http://us.archive.ubuntu.com/ubuntu/ bionic universe
> /etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/
> bionic-updates universe /etc/apt/sources.list:deb-src
> http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe
> /etc/apt/sources.list: /etc/apt/sources.list:## N.B. software from
> this repository is ENTIRELY UNSUPPORTED by the Ubuntu
> /etc/apt/sources.list:## team, and may not be under a free licence.
> Please satisfy yourself as to /etc/apt/sources.list:## your rights to
> use the software. Also, please note that software in
> /etc/apt/sources.list:## multiverse WILL NOT receive any review or
> updates from the Ubuntu /etc/apt/sources.list:## security team.
> /etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/ bionic
> multiverse /etc/apt/sources.list:deb-src
> http://us.archive.ubuntu.com/ubuntu/ bionic multiverse
> /etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/
> bionic-updates multiverse /etc/apt/sources.list:deb-src
> http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
> /etc/apt/sources.list: /etc/apt/sources.list:## N.B. software from
> this repository may not have been tested as /etc/apt/sources.list:##
> extensively as that contained in the main release, although it
> includes /etc/apt/sources.list:## newer versions of some applications
> which may provide useful features. /etc/apt/sources.list:## Also,
> please note that software in backports WILL NOT receive any review
> /etc/apt/sources.list:## or updates from the Ubuntu security team.
> /etc/apt/sources.list:deb http://us.archive.ubuntu.com/ubuntu/
> bionic-backports main restricted universe multiverse
> /etc/apt/sources.list:deb-src http://us.archive.ubuntu.com/ubuntu/
> bionic-backports main restricted universe multiverse
> /etc/apt/sources.list: /etc/apt/sources.list:deb
> http://security.ubuntu.com/ubuntu bionic-security main restricted
> /etc/apt/sources.list:deb-src http://security.ubuntu.com/ubuntu
> bionic-security main restricted /etc/apt/sources.list:deb
> http://security.ubuntu.com/ubuntu bionic-security universe
> /etc/apt/sources.list:deb-src http://security.ubuntu.com/ubuntu
> bionic-security universe /etc/apt/sources.list:deb
> http://security.ubuntu.com/ubuntu bionic-security multiverse
> /etc/apt/sources.list:deb-src http://security.ubuntu.com/ubuntu
> bionic-security multiverse /etc/apt/sources.list:
现在已经安装了新版本的一些软件包。如果我运行
sudo apt update && sudo apt upgrade -f
我明白了
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
python-rna : Depends: libgsl2 but it is not installable
E: Broken packages
需要帮助！