Please install all available updates for your release before upgrading.
允许从LTS版本升级到非LTS版本（20.04到20.10，18.04到18.10）
在20.04版本中，他们对失败的sudo do-release-upgrade添加了更清晰的提示信息：
Checking for a new Ubuntu release
There is no development version of an LTS available.
To upgrade to the latest non-LTS develoment release
set Prompt=normal in /etc/update-manager/release-upgrades.
Please install all available updates for your release before upgrading
software-properties-gtk
sudo apt update
sudo apt upgrade
sudo apt dist-upgrade
sudo do-release-upgrade
zfs list -t snapshot -r | grep auto | cut -f1 -d' ' | xargs -n 1 sudo zfs destroy
对于任何新版本，它无法找到新版本，具体如下：No new release found.
apt-get错过了其中一个升级，结果我得到了：Please install all available updates for your release before upgrading."
apt起作用。
从19.10升级到20.04：手动安装任何未自动升级的软件包
我在尝试从19.10升级到20.04时遇到了这个问题，它显示了相同的错误信息：请在升级之前安装所有可用的更新，所以我也会在这里提供解决方案给谷歌用户。sudo apt update
sudo apt upgrade
sudo apt dist-upgrade
sudo do-release-upgrade
sudo apt upgrade 告诉我：
The following packages have been kept back:
libomp-dev
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
do-release-upgrade出现了错误：请在升级之前安装所有可用的更新。
解决方法是手动安装libomp-dev：sudo apt install libomp-dev
do-release-upgrade就成功了！
sudo apt upgrade libomp-dev没有成功，只有apt install才行，upgrade失败了，错误信息如下：The following packages have unmet dependencies:
libomp-dev : Depends: libomp-9-dev (>= 9~) but it is not going to be installed
E: Broken packages
do-release-upgrade -d启用了开发版本，这通常不是您想要的
我建议不要使用do-release-upgrade -d，除非您确切知道自己在做什么，因为它会升级到不稳定的开发版本，而这不是大多数用户所希望的。
升级只能在ISO发布几天/几周后才可用
还请注意，升级并不会在18.10光盘发布的同时发布，似乎您必须等待几天，直到18.10.1发布后才能进行升级。
如果您在此之前尝试sudo do-release-upgrade，您仍将获得以下消息：
No new release found.
apt而不是apt-get的末尾注释正是我所需要的。 - Phlarxapt 运行 update 和 upgrade，然后再用 apt-get 来更新。 - Eerik Sven Puudistsudo apt-get autoremove - Eugene Kovalevsudo apt update 提示有一个可升级的软件包，并建议使用 apt list --upgradable 命令查看。这个软件包是 virtualenvwrapper。然后我使用 sudo apt install virtualenvwrapper 进行了升级。这解决了我的问题。 - akaiholalibomp-dev出了问题的呢？ - FirePapayasudo apt upgrade 告诉我，就像答案中提到的那样 :-) - Ciro Santilli OurBigBook.comszymon@szymon-Lenovo-Z580:~$ sudo apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
libodbc1 unixodbc
0 to upgrade, 0 to newly install, 0 to remove and 2 not to upgrade.
szymon@szymon-Lenovo-Z580:~$ sudo apt remove unixodbc libodbc1
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
odbcinst odbcinst1debian2
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED
freetds-bin libodbc1 msodbcsql17 mssql-tools unixodbc
sudo apt update
sudo apt upgrade
sudo apt dist-upgrade
sudo do-release-upgrade
sudo apt-get update && sudo apt-get upgrade
sudo apt dist-upgrade
sudo do-release-upgrade
-d 是升级到开发版本的选项，对于大多数用户来说可能是个糟糕的主意。请查看这个选项代替：https://askubuntu.com/questions/1085295/upgrade-form-18-04-to-18-10-issue/1100915#1100915 - Ciro Santilli OurBigBook.comdo-release-upgrade之前，还需要调用apt dist-upgrade。 - kapapt-get remove (软件包)，然后再执行apt-get autoremove，问题就解决了。cd /etc/apt/sources.list.d
for i in *.list; do mv ${i} ${i}.disabled; done
apt clean
apt autoclean
sudo do-release-upgrade
sudo apt-get update && sudo apt-get upgrade
之后，图形化的更新管理器（软件更新）正常工作...sudo apt update时，它是否显示All packages are up to date。sudo apt upgrade，系统可能不会升级所有内容。sudo do-release-upgrade。所以，我移除了Wine，然后执行sudo apt autoremove。The following packages have been kept back:
webp
现在我可以升级了！
Checking for a new Ubuntu release
You have not rebooted after updating a package which requires a reboot. Please reboot before upgrading.
sudo apt-get upgrade是否建议升级webp（可能是的，所以我只是按下了Y），或者我是否需要执行sudo apt remove webp ; sudo apt install webp，但在最新的数据包更新后，我能够升级到新版本。 - Aviosudo do-release-upgrade命令后，终端的输出结果是：apt architecture is i386
Upgrades from 18.04 on the i386 architecture are not supported at
this time.
sudo do-release-upgrade -d用于升级到最新的开发版本！而且只能从最新版本进行升级。）
apt-get dist-upgrade之后，我能够继续执行do-release-upgrade。apt-get update
apt-get upgrade
apt-get dist-upgrade
do-release-upgrade
do-release-upgrade。如果失败，请编辑你的问题，包括完整的终端输出。 - user535733apt-mark hold命令保留了任何软件包，您将需要取消保留或删除它们以避免出现此错误。 - Mahn