我遵循了这个答案：https://askubuntu.com/a/646918/1118094 我得到：
sudo ppa-purge ppa:haraldhv/shotcut
sudo ppa-purge ppa:indicator-brightness/ppa
sudo ppa-purge ppa:wireshark-dev/stable
sudo ppa-purge ppa:jonathonf/ffmpeg-4
sudo ppa-purge ppa:remmina-ppa-team/remmina-next
sudo ppa-purge ppa:graphics-drivers/ppa
sudo ppa-purge ppa:linuxuprising/java
所以我尝试了：
(base) nobu@gold3forever:~$ sudo ppa-purge ppa:haraldhv/shotcut
Updating packages lists
E: The repository 'http://apt.postgresql.org/pub/repos/apt bionic Release' does not have a Release file.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/ InRelease: The following signatures were invalid: EXPKEYSIG 51716619E084DAB9 Michael Rutter <[email protected]>
Warning: apt-get update failed for some reason
它还在那儿：
sudo ppa-purge ppa:haraldhv/shotcut
sudo ppa-purge ppa:indicator-brightness/ppa
sudo ppa-purge ppa:wireshark-dev/stable
sudo ppa-purge ppa:jonathonf/ffmpeg-4
sudo ppa-purge ppa:remmina-ppa-team/remmina-next
sudo ppa-purge ppa:graphics-drivers/ppa
sudo ppa-purge ppa:linuxuprising/java
我这样做了并删除了所有这些：https://help.ubuntu.com/community/Repositories/Ubuntu#Removing_.26_Disabling_Repositories 但我仍然得到这样的信息：
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
This was likely caused by:
* Unofficial software packages not provided by Ubuntu
Please use the tool 'ppa-purge' from the ppa-purge
package to remove software from a Launchpad PPA and
try the upgrade again.
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
you want to investigate this yourself the log files in
'/var/log/dist-upgrade' will contain details about the upgrade.
Specifically, look at 'main.log' and 'apt.log'.
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
(base) nobu@gold3forever:~$
所以我暂时放弃了，并按照建议去做了：
ubuntu-bug ubuntu-release-upgrader-core
编辑：我在尝试按照答案的建议操作时仍然遇到错误，因此打印出来main.log
(base) nobu@gold3forever:~$ cat /var/log/dist-upgrade/main.log
2020-11-01 11:12:26,729 INFO Using config files '['./DistUpgrade.cfg.bionic']'
2020-11-01 11:12:26,729 INFO uname information: 'Linux gold3forever 5.4.0-52-generic #57~18.04.1-Ubuntu SMP Thu Oct 15 14:04:49 UTC 2020 x86_64'
2020-11-01 11:12:27,342 INFO apt version: '1.6.12ubuntu0.1'
2020-11-01 11:12:27,342 INFO python version: '3.6.9 (default, Oct 8 2020, 12:12:24)
[GCC 8.4.0]'
2020-11-01 11:12:27,347 INFO release-upgrader version '20.04.28' started
2020-11-01 11:12:27,360 INFO locale: 'en_CA' 'UTF-8'
2020-11-01 11:12:27,429 INFO screen could not be run
2020-11-01 11:12:27,472 DEBUG Using 'DistUpgradeViewText' view
2020-11-01 11:12:27,535 DEBUG enable dpkg --force-overwrite
2020-11-01 11:12:27,582 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'
2020-11-01 11:12:39,571 DEBUG lsb-release: 'bionic'
2020-11-01 11:12:39,572 DEBUG _pythonSymlinkCheck run
2020-11-01 11:12:39,573 DEBUG openCache()
2020-11-01 11:12:39,574 DEBUG quirks: running PreCacheOpen
2020-11-01 11:12:39,574 DEBUG running Quirks.PreCacheOpen
2020-11-01 11:12:42,431 DEBUG Comparing 5.4.0-48 with
2020-11-01 11:12:42,431 DEBUG Comparing 5.4.0-52 with 5.4.0-48
2020-11-01 11:12:42,972 DEBUG /openCache(), new cache size 100275
2020-11-01 11:12:42,972 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2020-11-01 11:12:42,972 DEBUG checkViewDepends()
2020-11-01 11:12:42,974 DEBUG running doUpdate() (showErrors=False)
2020-11-01 11:12:46,304 DEBUG openCache()
2020-11-01 11:12:48,422 DEBUG Comparing 5.4.0-48 with
2020-11-01 11:12:48,422 DEBUG Comparing 5.4.0-52 with 5.4.0-48
2020-11-01 11:12:48,988 DEBUG /openCache(), new cache size 100275
2020-11-01 11:12:48,989 DEBUG doPostInitialUpdate
2020-11-01 11:12:48,989 DEBUG quirks: running focalPostInitialUpdate
2020-11-01 11:12:48,989 DEBUG running Quirks.focalPostInitialUpdate
2020-11-01 11:12:53,075 DEBUG Snap core18 is installed
2020-11-01 11:12:53,430 DEBUG Snap gnome-3-34-1804 is installed
2020-11-01 11:12:53,432 DEBUG Snap gnome-3-34-1804 is not tracking the release channel
2020-11-01 11:12:53,784 DEBUG Snap gtk-common-themes is installed
2020-11-01 11:12:54,461 DEBUG Snap gnome-3-28-1804 is installed
2020-11-01 11:12:54,495 DEBUG Snap gnome-3-28-1804 is being used by gedit. Switching it to stable track
2020-11-01 11:12:54,920 DEBUG Snap gnome-calculator is installed
2020-11-01 11:12:55,275 DEBUG Snap gnome-characters is installed
2020-11-01 11:12:56,157 DEBUG Snap gnome-logs is installed
2020-11-01 11:13:01,670 DEBUG MetaPkgs: ubuntu-desktop
2020-11-01 11:13:13,335 DEBUG Foreign: code containerd.io docker-ce docker-ce-cli google-chrome-stable libodbc1 nodejs odbcinst odbcinst1debian2 packages-microsoft-prod sbt unixodbc
2020-11-01 11:13:13,336 DEBUG Obsolete:
2020-11-01 11:13:13,336 DEBUG updateSourcesList()
2020-11-01 11:13:13,356 DEBUG rewriteSourcesList() with mirror_check
2020-11-01 11:13:13,356 DEBUG ['ubuntu-minimal', 'ubuntu-standard']
2020-11-01 11:13:13,357 DEBUG Checking pkg: ubuntu-minimal
2020-11-01 11:13:13,361 DEBUG Checking pkg: ubuntu-standard
2020-11-01 11:13:13,365 DEBUG examining: 'deb http://ca.archive.ubuntu.com/ubuntu/ bionic main restricted'
2020-11-01 11:13:13,366 DEBUG verifySourcesListEntry: deb http://ca.archive.ubuntu.com/ubuntu/ focal main restricted
2020-11-01 11:13:13,366 DEBUG url_downloadable: http://ca.archive.ubuntu.com/ubuntu//dists/focal/Release
2020-11-01 11:13:13,366 DEBUG s='http' n='ca.archive.ubuntu.com' p='/ubuntu//dists/focal/Release' q='' f=''
2020-11-01 11:13:13,653 DEBUG entry 'deb http://ca.archive.ubuntu.com/ubuntu/ focal main restricted' updated to new dist
2020-11-01 11:13:13,653 DEBUG examining: 'deb http://ca.archive.ubuntu.com/ubuntu/ bionic-updates main restricted'
2020-11-01 11:13:13,654 DEBUG entry 'deb http://ca.archive.ubuntu.com/ubuntu/ focal-updates main restricted' updated to new dist
2020-11-01 11:13:13,654 DEBUG examining: 'deb http://ca.archive.ubuntu.com/ubuntu/ bionic universe'
2020-11-01 11:13:13,654 DEBUG entry 'deb http://ca.archive.ubuntu.com/ubuntu/ focal universe' updated to new dist
2020-11-01 11:13:13,655 DEBUG examining: 'deb http://ca.archive.ubuntu.com/ubuntu/ bionic-updates universe'
2020-11-01 11:13:13,655 DEBUG entry 'deb http://ca.archive.ubuntu.com/ubuntu/ focal-updates universe' updated to new dist
2020-11-01 11:13:13,655 DEBUG examining: 'deb http://ca.archive.ubuntu.com/ubuntu/ bionic multiverse'
2020-11-01 11:13:13,656 DEBUG entry 'deb http://ca.archive.ubuntu.com/ubuntu/ focal multiverse' updated to new dist
2020-11-01 11:13:13,656 DEBUG examining: 'deb http://ca.archive.ubuntu.com/ubuntu/ bionic-updates multiverse'
2020-11-01 11:13:13,656 DEBUG entry 'deb http://ca.archive.ubuntu.com/ubuntu/ focal-updates multiverse' updated to new dist
2020-11-01 11:13:13,656 DEBUG examining: 'deb http://ca.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse'
2020-11-01 11:13:13,657 DEBUG entry 'deb http://ca.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse' updated to new dist
2020-11-01 11:13:13,657 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security main restricted'
2020-11-01 11:13:13,657 DEBUG verifySourcesListEntry: deb http://security.ubuntu.com/ubuntu focal main restricted
2020-11-01 11:13:13,657 DEBUG url_downloadable: http://security.ubuntu.com/ubuntu/dists/focal/Release
2020-11-01 11:13:13,657 DEBUG s='http' n='security.ubuntu.com' p='/ubuntu/dists/focal/Release' q='' f=''
2020-11-01 11:13:14,002 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security main restricted' updated to new dist
2020-11-01 11:13:14,003 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security universe'
2020-11-01 11:13:14,006 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security universe' updated to new dist
2020-11-01 11:13:14,006 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu bionic-security multiverse'
2020-11-01 11:13:14,007 DEBUG entry 'deb http://security.ubuntu.com/ubuntu focal-security multiverse' updated to new dist
2020-11-01 11:13:14,007 DEBUG examining: 'deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable'
2020-11-01 11:13:14,010 DEBUG entry '# deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable # disabled on upgrade to focal' was disabled (unknown mirror)
2020-11-01 11:13:14,010 DEBUG examining: 'deb https://dl.yarnpkg.com/debian/ stable main'
2020-11-01 11:13:14,012 DEBUG entry '# deb https://dl.yarnpkg.com/debian/ stable main # disabled on upgrade to focal' was disabled (unknown mirror)
2020-11-01 11:13:14,012 DEBUG examining: 'deb https://dl.bintray.com/sbt/debian /'
2020-11-01 11:13:14,014 DEBUG entry '# deb https://dl.bintray.com/sbt/debian / # disabled on upgrade to focal' was disabled (unknown mirror)
2020-11-01 11:13:14,015 DEBUG examining: 'deb [arch=amd64,arm64,armhf] https://packages.microsoft.com/debian/10/prod buster main'
2020-11-01 11:13:14,017 DEBUG entry '# deb [arch=amd64,arm64,armhf] https://packages.microsoft.com/debian/10/prod buster main # disabled on upgrade to focal' was disabled (unknown mirror)
2020-11-01 11:13:14,017 DEBUG examining: 'deb https://deb.nodesource.com/node_12.x bionic main'
2020-11-01 11:13:14,019 DEBUG entry '# deb https://deb.nodesource.com/node_12.x focal main # disabled on upgrade to focal' was disabled (unknown mirror)
2020-11-01 11:13:14,019 DEBUG examining: 'deb-src https://deb.nodesource.com/node_12.x bionic main'
2020-11-01 11:13:14,021 DEBUG entry '# deb-src https://deb.nodesource.com/node_12.x focal main # disabled on upgrade to focal' was disabled (unknown mirror)
2020-11-01 11:13:14,021 DEBUG examining: 'deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main'
2020-11-01 11:13:14,022 DEBUG entry '# deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main # disabled on upgrade to focal' was disabled (unknown mirror)
2020-11-01 11:13:17,820 DEBUG running doUpdate() (showErrors=True)
2020-11-01 11:14:00,798 DEBUG openCache()
2020-11-01 11:14:02,252 DEBUG Comparing 5.4.0-48 with
2020-11-01 11:14:02,252 DEBUG Comparing 5.4.0-52 with 5.4.0-48
2020-11-01 11:14:02,624 DEBUG /openCache(), new cache size 66760
2020-11-01 11:14:02,625 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2020-11-01 11:14:02,626 DEBUG quirks: running PreDistUpgradeCache
2020-11-01 11:14:02,626 DEBUG running Quirks.PreDistUpgradeCache
2020-11-01 11:14:02,626 INFO checking for python-dbg
2020-11-01 11:14:02,626 INFO checking for python-doc
2020-11-01 11:14:02,626 INFO checking for python-minimal
2020-11-01 11:14:02,626 INFO installing python-is-python2 because python-minimal was installed
2020-11-01 11:14:02,626 DEBUG Installing 'python-is-python2' (python-minimal was installed on the system)
2020-11-01 11:14:02,942 ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'
2020-11-01 11:14:02,946 DEBUG abort called
2020-11-01 11:14:02,957 DEBUG openCache()
2020-11-01 11:14:08,062 DEBUG Comparing 5.4.0-48 with
2020-11-01 11:14:08,062 DEBUG Comparing 5.4.0-52 with 5.4.0-48
2020-11-01 11:14:08,670 DEBUG /openCache(), new cache size 100275
(base) nobu@gold3forever:~$
它说包损坏了所以我按照本教程尝试修复它们：https://www.maketecheasier.com/fix-broken-packages-ubuntu/ 实际上我刚刚注意到我删除的所有 PPA 都回来了：
我的 apt.log 输出如下。
(base) nobu@gold3forever:~$ cat /var/log/dist-upgrade/apt.log
Log time: 2020-11-01 11:12:42.965940
Log time: 2020-11-01 11:12:48.970968
Log time: 2020-11-01 11:14:02.597658
MarkInstall python-is-python2:amd64 < none -> 2.7.17-4 @un uN Ib > FU=1
Installing python2 as Depends of python-is-python2
MarkInstall python2:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
Installing python2-minimal as PreDepends of python2
MarkInstall python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
Removing: python-minimal
MarkDelete python-minimal:amd64 < 2.7.15~rc1-1 @ii mK > FU=0
Installing libpython2-stdlib as Depends of python2
MarkInstall libpython2-stdlib:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
Removing: libpython-stdlib
MarkDelete libpython-stdlib:amd64 < 2.7.15~rc1-1 @ii mK > FU=0
Removing: python
MarkDelete python:amd64 < 2.7.15~rc1-1 @ii mK Ib > FU=0
Starting pkgProblemResolver with broken count: 3
Starting 2 pkgProblemResolver with broken count: 3
Investigating (0) nodejs:amd64 < 12.19.0-1nodesource1 @ii mK Ib >
Broken nodejs:amd64 Depends on python-minimal:amd64 < 2.7.15~rc1-1 @ii gR >
Considering python-minimal:amd64 1 as a solution to nodejs:amd64 114
Added python-minimal:amd64 to the remove list
Fixing nodejs:amd64 via keep of python-minimal:amd64
MarkKeep python-minimal:amd64 < 2.7.15~rc1-1 @ii gR > FU=0
Investigating (0) python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2-minimal:amd64 Breaks on python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > (< 2.7.15-2)
Considering python-minimal:amd64 1 as a solution to python2-minimal:amd64 3
Added python-minimal:amd64 to the remove list
Fixing python2-minimal:amd64 via remove of python-minimal:amd64
MarkDelete python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > FU=0
Investigating (0) python-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib >
Broken python-all-dev:amd64 Depends on libpython-all-dev:amd64 < 2.7.15~rc1-1 | 2.7.17-2ubuntu4 @ii umH > (= 2.7.17-2ubuntu4)
Considering libpython-all-dev:amd64 0 as a solution to python-all-dev:amd64 1
MarkKeep python-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib > FU=0
Re-Instated libpython2-dev:amd64
Re-Instated libpython-all-dev:amd64
Re-Instated python2-dev:amd64
Re-Instated python-all-dev:amd64
Investigating (0) python2-dev:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib >
Broken python2-dev:amd64 Breaks on python-dev:amd64 < 2.7.15~rc1-1 @ii mK Ib > (< 2.7.15-2)
Considering python-dev:amd64 -1 as a solution to python2-dev:amd64 0
Added python-dev:amd64 to the remove list
Fixing python2-dev:amd64 via remove of python-dev:amd64
MarkDelete python-dev:amd64 < 2.7.15~rc1-1 @ii mK Ib > FU=0
Investigating (0) libpython2-dev:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib >
Broken libpython2-dev:amd64 Breaks on libpython-dev:amd64 < 2.7.15~rc1-1 @ii mK > (< 2.7.15-2)
Considering libpython-dev:amd64 0 as a solution to libpython2-dev:amd64 0
MarkKeep libpython2-dev:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
Holding Back libpython2-dev:amd64 rather than change libpython-dev:amd64
Investigating (0) libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mK Ib >
Broken libboost-python1.65-dev:amd64 Depends on python-dev:amd64 < 2.7.15~rc1-1 @ii mR >
Considering python-dev:amd64 -1 as a solution to libboost-python1.65-dev:amd64 -1
Removing libboost-python1.65-dev:amd64 rather than change python-dev:amd64
MarkDelete libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mK Ib > FU=0
Investigating (1) nodejs:amd64 < 12.19.0-1nodesource1 @ii mK Ib >
Broken nodejs:amd64 Depends on python-minimal:amd64 < 2.7.15~rc1-1 @ii gR >
Considering python-minimal:amd64 1 as a solution to nodejs:amd64 114
Added python-minimal:amd64 to the remove list
Fixing nodejs:amd64 via keep of python-minimal:amd64
MarkKeep python-minimal:amd64 < 2.7.15~rc1-1 @ii gR > FU=0
Investigating (1) python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2-minimal:amd64 Breaks on python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > (< 2.7.15-2)
Considering python-minimal:amd64 1 as a solution to python2-minimal:amd64 3
Added python-minimal:amd64 to the remove list
Fixing python2-minimal:amd64 via remove of python-minimal:amd64
MarkDelete python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > FU=0
Investigating (1) python2-dev:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib >
Broken python2-dev:amd64 Depends on libpython2-dev:amd64 < none | 2.7.17-2ubuntu4 @un uH > (= 2.7.17-2ubuntu4)
Considering libpython2-dev:amd64 0 as a solution to python2-dev:amd64 0
MarkKeep python2-dev:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
Holding Back python2-dev:amd64 rather than change libpython2-dev:amd64
Investigating (1) libboost-python-dev:amd64 < 1.65.1.0ubuntu1 | 1.71.0.0ubuntu2 @ii umH Ib >
Broken libboost-python-dev:amd64 Depends on libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mR >
Considering libboost-python1.65-dev:amd64 -1 as a solution to libboost-python-dev:amd64 0
Added libboost-python1.65-dev:amd64 to the remove list
Fixing libboost-python-dev:amd64 via keep of libboost-python1.65-dev:amd64
MarkKeep libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mR > FU=0
Investigating (1) libpython-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib >
Broken libpython-all-dev:amd64 Depends on libpython2-dev:amd64 < none | 2.7.17-2ubuntu4 @un uH > (= 2.7.17-2ubuntu4)
Considering libpython2-dev:amd64 0 as a solution to libpython-all-dev:amd64 0
MarkKeep libpython-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib > FU=0
Holding Back libpython-all-dev:amd64 rather than change libpython2-dev:amd64
Investigating (1) libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mK Ib >
Broken libboost-python1.65-dev:amd64 Depends on python-dev:amd64 < 2.7.15~rc1-1 @ii mR >
Considering python-dev:amd64 -1 as a solution to libboost-python1.65-dev:amd64 -1
Removing libboost-python1.65-dev:amd64 rather than change python-dev:amd64
MarkDelete libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mK Ib > FU=0
Investigating (2) nodejs:amd64 < 12.19.0-1nodesource1 @ii mK Ib >
Broken nodejs:amd64 Depends on python-minimal:amd64 < 2.7.15~rc1-1 @ii gR >
Considering python-minimal:amd64 1 as a solution to nodejs:amd64 114
Added python-minimal:amd64 to the remove list
Fixing nodejs:amd64 via keep of python-minimal:amd64
MarkKeep python-minimal:amd64 < 2.7.15~rc1-1 @ii gR > FU=0
Investigating (2) python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2-minimal:amd64 Breaks on python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > (< 2.7.15-2)
Considering python-minimal:amd64 114 as a solution to python2-minimal:amd64 3
MarkKeep python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib > FU=0
Holding Back python2-minimal:amd64 rather than change python-minimal:amd64
Investigating (2) python-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib >
Broken python-all-dev:amd64 Depends on libpython-all-dev:amd64 < 2.7.15~rc1-1 | 2.7.17-2ubuntu4 @ii umH > (= 2.7.17-2ubuntu4)
Considering libpython-all-dev:amd64 0 as a solution to python-all-dev:amd64 1
MarkKeep python-all-dev:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib > FU=0
Removing python-all-dev:amd64 rather than change libpython-all-dev:amd64
MarkDelete python-all-dev:amd64 < 2.7.15~rc1-1 | 2.7.17-2ubuntu4 @ii umH Ib > FU=0
Investigating (2) libboost-python-dev:amd64 < 1.65.1.0ubuntu1 | 1.71.0.0ubuntu2 @ii umH Ib >
Broken libboost-python-dev:amd64 Depends on libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mR >
Considering libboost-python1.65-dev:amd64 -1 as a solution to libboost-python-dev:amd64 0
Added libboost-python1.65-dev:amd64 to the remove list
Fixing libboost-python-dev:amd64 via keep of libboost-python1.65-dev:amd64
MarkKeep libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mR > FU=0
Investigating (2) libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mK Ib >
Broken libboost-python1.65-dev:amd64 Depends on python-dev:amd64 < 2.7.15~rc1-1 @ii mR >
Considering python-dev:amd64 -1 as a solution to libboost-python1.65-dev:amd64 0
Added python-dev:amd64 to the remove list
Fixing libboost-python1.65-dev:amd64 via keep of python-dev:amd64
MarkKeep python-dev:amd64 < 2.7.15~rc1-1 @ii mR > FU=0
Investigating (2) python-dev:amd64 < 2.7.15~rc1-1 @ii mK Ib >
Broken python-dev:amd64 Depends on python:amd64 < 2.7.15~rc1-1 @ii gR > (= 2.7.15~rc1-1)
Considering python:amd64 1 as a solution to python-dev:amd64 0
Removing python-dev:amd64 rather than change python:amd64
MarkDelete python-dev:amd64 < 2.7.15~rc1-1 @ii mK Ib > FU=0
Investigating (3) python2:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2:amd64 PreDepends on python2-minimal:amd64 < none | 2.7.17-2ubuntu4 @un umH > (= 2.7.17-2ubuntu4)
Considering python2-minimal:amd64 3 as a solution to python2:amd64 5
MarkKeep python2:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib > FU=0
Holding Back python2:amd64 rather than change python2-minimal:amd64
Investigating (3) python-all:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib >
Broken python-all:amd64 Depends on python2:amd64 < none | 2.7.17-2ubuntu4 @un umH > (= 2.7.17-2ubuntu4)
Considering python2:amd64 5 as a solution to python-all:amd64 2
MarkKeep python-all:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib > FU=0
Re-Instated python2-minimal:amd64
Re-Instated python2:amd64
Re-Instated python-all:amd64
Investigating (3) libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mK Ib >
Broken libboost-python1.65-dev:amd64 Depends on python-dev:amd64 < 2.7.15~rc1-1 @ii mR >
Considering python-dev:amd64 1 as a solution to libboost-python1.65-dev:amd64 0
Removing libboost-python1.65-dev:amd64 rather than change python-dev:amd64
MarkDelete libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mK Ib > FU=0
Investigating (4) python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2-minimal:amd64 Breaks on python-minimal:amd64 < 2.7.15~rc1-1 @ii gK > (< 2.7.15-2)
Considering python-minimal:amd64 114 as a solution to python2-minimal:amd64 3
MarkKeep python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib > FU=0
Holding Back python2-minimal:amd64 rather than change python-minimal:amd64
Investigating (4) libboost-python-dev:amd64 < 1.65.1.0ubuntu1 | 1.71.0.0ubuntu2 @ii umH Ib >
Broken libboost-python-dev:amd64 Depends on libboost-python1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mR >
Considering libboost-python1.65-dev:amd64 1 as a solution to libboost-python-dev:amd64 0
Re-Instated libboost1.71-dev:amd64
Re-Instated gcc-10-base:amd64
Re-Instated libgcc-s1:amd64
Re-Instated libboost-python1.71.0:amd64
Re-Instated libboost-python1.71-dev:amd64
Re-Instated libboost-python-dev:amd64
Investigating (5) python2:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib >
Broken python2:amd64 PreDepends on python2-minimal:amd64 < none | 2.7.17-2ubuntu4 @un umH > (= 2.7.17-2ubuntu4)
Considering python2-minimal:amd64 3 as a solution to python2:amd64 5
MarkKeep python2:amd64 < none -> 2.7.17-2ubuntu4 @un umN Ib > FU=0
Holding Back python2:amd64 rather than change python2-minimal:amd64
Investigating (5) python-all:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib >
Broken python-all:amd64 Depends on python2:amd64 < none | 2.7.17-2ubuntu4 @un umH > (= 2.7.17-2ubuntu4)
Considering python2:amd64 5 as a solution to python-all:amd64 2
MarkKeep python-all:amd64 < 2.7.15~rc1-1 -> 2.7.17-2ubuntu4 @ii umU Ib > FU=0
Removing python-all:amd64 rather than change python2:amd64
MarkDelete python-all:amd64 < 2.7.15~rc1-1 | 2.7.17-2ubuntu4 @ii umH Ib > FU=0
Investigating (5) libboost1.71-dev:amd64 < none -> 1.71.0-6ubuntu6 @un uN Ib >
Broken libboost1.71-dev:amd64 Conflicts on libboost1.65-dev:amd64 < 1.65.1+dfsg-0ubuntu5 @ii mK >
Considering libboost1.65-dev:amd64 38 as a solution to libboost1.71-dev:amd64 0
MarkKeep libboost1.71-dev:amd64 < none -> 1.71.0-6ubuntu6 @un uN Ib > FU=0
Holding Back libboost1.71-dev:amd64 rather than change libboost1.65-dev:amd64
Investigating (5) libboost-python1.71-dev:amd64 < none -> 1.71.0-6ubuntu6 @un uN Ib >
Broken libboost-python1.71-dev:amd64 Depends on libboost1.71-dev:amd64 < none | 1.71.0-6ubuntu6 @un uH > (= 1.71.0-6ubuntu6)
Considering libboost1.71-dev:amd64 0 as a solution to libboost-python1.71-dev:amd64 0
MarkKeep libboost-python1.71-dev:amd64 < none -> 1.71.0-6ubuntu6 @un uN Ib > FU=0
Holding Back libboost-python1.71-dev:amd64 rather than change libboost1.71-dev:amd64
Investigating (6) python-is-python2:amd64 < none -> 2.7.17-4 @un pumN Ib >
Broken python-is-python2:amd64 Depends on python2:amd64 < none | 2.7.17-2ubuntu4 @un umH >
Considering python2:amd64 5 as a solution to python-is-python2:amd64 9999
Investigating (6) libboost-python-dev:amd64 < 1.65.1.0ubuntu1 -> 1.71.0.0ubuntu2 @ii umU Ib >
Broken libboost-python-dev:amd64 Depends on libboost-python1.71-dev:amd64 < none | 1.71.0-6ubuntu6 @un uH >
Considering libboost-python1.71-dev:amd64 0 as a solution to libboost-python-dev:amd64 0
MarkKeep libboost-python-dev:amd64 < 1.65.1.0ubuntu1 -> 1.71.0.0ubuntu2 @ii umU Ib > FU=0
Removing libboost-python-dev:amd64 rather than change libboost-python1.71-dev:amd64
MarkDelete libboost-python-dev:amd64 < 1.65.1.0ubuntu1 | 1.71.0.0ubuntu2 @ii umH Ib > FU=0
Investigating (6) libboost-all-dev:amd64 < 1.65.1.0ubuntu1 | 1.71.0.0ubuntu2 @ii umH Ib >
Broken libboost-all-dev:amd64 Depends on libboost-python-dev:amd64 < 1.65.1.0ubuntu1 | 1.71.0.0ubuntu2 @ii umR >
Considering libboost-python-dev:amd64 0 as a solution to libboost-all-dev:amd64 -1
Reinst Failed because of libboost-python-dev:amd64
MarkKeep libboost-all-dev:amd64 < 1.65.1.0ubuntu1 -> 1.71.0.0ubuntu2 @ii umU Ib > FU=0
Removing libboost-all-dev:amd64 rather than change libboost-python-dev:amd64
MarkDelete libboost-all-dev:amd64 < 1.65.1.0ubuntu1 | 1.71.0.0ubuntu2 @ii umH Ib > FU=0
Investigating (7) python-is-python2:amd64 < none -> 2.7.17-4 @un pumN Ib >
Broken python-is-python2:amd64 Depends on python2:amd64 < none | 2.7.17-2ubuntu4 @un umH >
Considering python2:amd64 5 as a solution to python-is-python2:amd64 9999
Done
Log time: 2020-11-01 11:14:08.645231
它看起来与 Python 相关，但我被告知不要删除 Python 2。
答案1
在软件源中禁用 PPA（
software-properties-gtk）并启用所有官方频道（主频道、宇宙频道、多元频道）运行更新
sudo apt update sudo apt upgrade sudo apt dist-upgrade sudo apt auto-remove检查过时的软件包，进行安全清除，如果您有疑问，请在此处更新/提问。
aptitude search '~o'比较之前的列表：
aptitude search '~S (!~O|~o) ~i'然后使用以下命令检查所有附加包：
apt-cache policy <packagesname>...如果其中任何一个可从官方存储库获得，那么您需要强制降级它们，使用：
sudo apt install <packagename>=<version>...（使用脚本可以使这一步更容易）
如果您确定之前的列表，则软件包是额外的，不是系统必需的。模拟再次检查
aptitude -s -y remove '~o'然后真正地奔跑
sudo aptitude remove '~o' sudo apt auto-remove
再次进行 Ubuntu 升级。