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.
我尝试过多次更新、升级和重新启动，但仍然出现这个错误。
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，然后重试sudo do-release-upgrade。它开始工作了，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
答案1
apt update && apt upgrade 后，您有 1 个未升级的包，它是 cloud-init。
sudo apt install --only-upgrade cloud-init