请在升级前为您的版本安装所有可用的更新

尝试使用本指南 :https://www.digitalocean.com/community/tutorials/how-to-upgrade-to-ubuntu-20-04-focal-fossa

我跑 sudo do-release-upgrade

它告诉我 Please install all available updates for your release before upgrading.

我已经尝试更新和升级并重新启动了很多次，但它仍然只是说这个错误。.

sudo apt update && sudo apt upgrade

root@lospec-stage-pre-gallery-beta-update-s-2vcpu-2gb-nyc3-01:~# sudo apt update && sudo apt upgrade Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [99.8 kB] Hit:2 http://mirrors.digitalocean.com/ubuntu xenial InRelease Hit:3 http://mirrors.digitalocean.com/ubuntu xenial-updates InRelease Hit:4 http://mirrors.digitalocean.com/ubuntu xenial-backports InRelease Hit:5 https://deb.nodesource.com/node_16.x xenial InRelease Hit:6 http://ppa.launchpad.net/certbot/certbot/ubuntu xenial InRelease Hit:7 https://repos.insights.digitalocean.com/apt/do-agent main InRelease Hit:8 https://esm.ubuntu.com/infra/ubuntu xenial-infra-security InRelease Ign:9 https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/4.0 InRelease Hit:10 https://esm.ubuntu.com/infra/ubuntu xenial-infra-updates InRelease Ign:11 https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/4.2 InRelease Hit:12 https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/4.0 Release Hit:13 https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/4.2 Release Fetched 99.8 kB in 2s (48.0 kB/s) Reading package lists... Done Building dependency tree Reading state information... Done 1 package can be upgraded. Run 'apt list --upgradable' to see it. Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following package was automatically installed and is no longer required: libllvm3.8 Use 'sudo apt autoremove' to remove it. The following packages have been kept back: cloud-init 0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. 

apt policy cloud-init

root@lospec-stage-pre-gallery-beta-update-s-2vcpu-2gb-nyc3-01:~# apt policy cloud-init cloud-init: Installed: 0.7.9-90-g61eb03fe-0ubuntu1~16.04.1 Candidate: 21.1-19-gbad84ad4-0ubuntu1~16.04.2 Version table: 21.1-19-gbad84ad4-0ubuntu1~16.04.2 500 500 http://mirrors.digitalocean.com/ubuntu xenial-updates/main amd64 Packages *** 0.7.9-90-g61eb03fe-0ubuntu1~16.04.1 100 100 /var/lib/dpkg/status 0.7.7~bzr1212-0ubuntu1 500 500 http://mirrors.digitalocean.com/ubuntu xenial/main amd64 Packages 

apt-get dist-upgrade

root@lospec-stage-pre-gallery-beta-update-s-2vcpu-2gb-nyc3-01:~# sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following package was automatically installed and is no longer required: libllvm3.8 Use 'sudo apt autoremove' to remove it. The following security updates require Ubuntu Pro with 'esm-infra' enabled: libpam0g libgssapi3-heimdal libxdmcp6 libpcre16-3 perl-base libpolkit-gobject-1-0 libdjvulibre-text libcroco3 libwebp5 libdns-export162 fuse libcomerr2 python2.7-dev libjpeg-turbo8-dev libisccfg140 libcups2 libdbus-1-3 libwind0-heimdal uuid-runtime linux-headers-generic libfdisk1 libpcre3-dev libsasl2-modules-db linux-libc-dev vim-common libcurl3 gnupg-agent libldap-2.4-2 libpam-modules openssl ruby2.3 libxslt1-dev byobu libc6-dev imagemagick libpam0g-dev ntfs-3g git-man libsystemd0 libexpat1-dev libgd3 libheimntlm0-heimdal libksba8 libgs9 dbus python2.7-minimal libmount1 tcpdump snapd libsqlite3-0 libxrender1 libicu55 binutils libmagickwand-6.q16-2 squashfs-tools bind9-host libvpx-dev e2fsprogs zlib1g libcgraph6 libavahi-common-data dnsutils libgmp10 perl-modules-5.22 libavahi-common3 libpython2.7 libncurses5 python2.7 dnsmasq-base libheimbase1-heimdal libc6 util-linux libpython3.5 python3.5 libgmp-dev open-vm-tools git openssh-sftp-server python3.5-minimal libsepol1 libpolkit-agent-1-0 libisc160 libpython2.7-dev udev locales libpcre32-3 passwd libsasl2-2 zlib1g-dev libklibc libpam-runtime e2fslibs isc-dhcp-common libncursesw5 libgmpxx4ldbl libx11-6 libexpat1 libudev1 libvpx3 rsyslog libwebpdemux1 libpng12-dev libtiff5-dev dirmngr libss2 mount libperl5.22 libaspell15 apport gdisk libblkid1 dpkg imagemagick-6.q16 libtiff5 libmagickcore-6.q16-2-extra libisc-export160 busybox-static libc-bin man-db libsasl2-modules libtinfo5 libruby2.3 python3-apport libxi6 libxmlsec1-openssl libjbig2dec0 libpcre3 libfuse2 linux-virtual libfreetype6-dev tar systemd-sysv libcurl4-openssl-dev libuuid1 libxdmcp-dev libgcrypt20 libxml2-dev liblwres141 libhcrypto4-heimdal libglib2.0-bin vim-runtime liblz4-1 gpgv ubuntu-core-launcher libncurses5-dev vim libpam-systemd libtinfo-dev libcdt5 distro-info-data xz-utils ncurses-term libglib2.0-dev ghostscript libpathplan4 systemd libsmartcols1 login libsepol1-dev libssl-dev libxfixes3 libssl-doc libpolkit-backend-1-0 libwebpmux1 ncurses-bin libpam-modules-bin openssh-server libx11-data ghostscript-x aspell libgvpr2 libopenexr22 unzip openssh-client libmagickcore-6.q16-2 sosreport libgs9-common bsdutils linux-headers-virtual libgraphite2-3 libdns162 libx11-dev libjpeg-turbo8 libx11-doc libglib2.0-data ncurses-base gnupg2 bash policykit-1 libdjvulibre21 libc-dev-bin libxml2 libwebp-dev webp libpython2.7-minimal multiarch-support cpio libroken18-heimdal libfreetype6 ca-certificates libicu-dev perl rsync vim-tiny imagemagick-common libasn1-8-heimdal libzstd1 libisccc140 libkrb5-26-heimdal cron linux-image-virtual libpython3.5-stdlib libbind9-140 gzip python3-jinja2 libtasn1-6 gnupg libgvc6 icu-devtools libpcrecpp0v5 libcairo2 libcupsimage2 libpython2.7-stdlib liblzma5 libpython3.5-minimal libavahi-client3 curl libdpkg-perl libhx509-5-heimdal isc-dhcp-client klibc-utils graphviz python3-problem-report libpng12-0 libglib2.0-0 liblzma-dev libxmlsec1 uidmap libcurl3-gnutls libx11-xcb1 libtiffxx5 libperl-dev libgd-dev libxslt1.1 libssl1.0.0 dpkg-dev tzdata busybox-initramfs Learn more about Ubuntu Pro for 16.04 at https://ubuntu.com/16-04 The following packages have been kept back: cloud-init 0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. 

我卸载了 cloud-init，然后再次尝试 sudo do-release-upgrade。. 它开始起作用，但最后我得到了这个 :

Checking package manager Reading package lists... Done Building dependency tree Reading state information... Done Invalid package information 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. Restoring original system state Aborting