Cannot update after 20.04 version

Question

After updating to version 20.04 (forcefully using -d command), I am not able to update or upgrade neither using termical nor using software now.

import apt_pkg  
ImportError: libapt-pkg.so.6.0: cannot open shared object file: No such file or directory  
Reading package lists... Done  
E: Problem executing scripts APT::Update::Post-Invoke-Success 'if /usr/bin/test -w  
/var/lib/command-not-found/ -a -e /usr/lib/cnf-update-db; then /usr/lib/cnf-update-db >  
/dev/null; fi'  
E: Sub-process returned an error code

This returned in the last while trying to update, also I have a red marker beside the battery icon which says the same "a problem occurred when checking for updates"

Contents at cd /etc/apt/sources.list.d/

-rw-r--r-- 1 root root 221 Aug 27 23:59 google-chrome.list  
-rw-r--r-- 1 root root 189 Aug 27 23:20 google-chrome.list.distUpgrade

Any help would be appreciated. I am new to Ubuntu.

Edit: sudo apt upgrade gives this error:

E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... failed.
The following packages have unmet dependencies:
 dirmngr : Depends: init-system-helpers (>= 1.52) but 1.51 is installed
 gir1.2-gtk-3.0 : Depends: gir1.2-gdkpixbuf-2.0 (>= 2.40.0) but 2.36.11-2 is installed
                  Depends: gir1.2-pango-1.0 (>= 1.41.0) but 1.40.14-1ubuntu0.1 is installed
                  Depends: libgtk-3-0 (>= 3.24.7) but 3.22.30-1ubuntu4 is installed
 gnupg : Depends: gpgv (>= 2.2.19-3ubuntu2)
 gpg-agent : Depends: init-system-helpers (>= 1.52) but 1.51 is installed
 hplip : Depends: hplip-data (= 3.20.3+dfsg0-2) but 3.17.10+repack0-5 is installed
         Depends: libhpmud0 (= 3.20.3+dfsg0-2) but 3.17.10+repack0-5 is installed
         Depends: printer-driver-hpcups (= 3.20.3+dfsg0-2) but 3.17.10+repack0-5 is installed
         Depends: libpython3.8 (>= 3.8.2) but it is not installed
 libsane-hpaio : Depends: libhpmud0 (>= 3.20.3+dfsg0) but 3.17.10+repack0-5 is installed
 python3-apt : Depends: libapt-pkg6.0 (>= 1.9.11~) but it is not installed
 python3-brlapi : Depends: libbrlapi0.7 but it is not installed
 python3-gi : Depends: libgirepository-1.0-1 (>= 1.62.0-4~) but 1.56.1-1 is installed
 python3-pil : Depends: libimagequant0 (>= 2.11.10) but it is not installed
 python3-protobuf : Depends: libprotobuf17 but it is not installed
 python3-uno : Depends: libreoffice-core (= 1:6.4.5-0ubuntu0.20.04.1) but 1:6.0.7-0ubuntu0.18.04.10 is installed or
                        libreoffice-core-nogui (= 1:6.4.5-0ubuntu0.20.04.1) but it is not installed
               Depends: libpython3.8 (>= 3.8.2) but it is not installed
               Depends: libuno-cppu3 (>= 4.4.0~alpha) but it is not installed
               Depends: libuno-cppuhelpergcc3-3 (>= 5.3.0~alpha) but it is not installed
               Depends: libuno-sal3 (>= 5.4.0~alpha) but it is not installed
               Depends: libuno-salhelpergcc3-3 (>= 3.6.0~beta) but it is not installed
               Depends: uno-libs-private but it is not installed
 rhythmbox-plugins : Depends: librhythmbox-core10 (= 3.4.4-1ubuntu2) but 3.4.2-4ubuntu1 is installed
                     Depends: rhythmbox (= 3.4.4-1ubuntu2) but 3.4.2-4ubuntu1 is installed
                     Depends: gir1.2-rb-3.0 (= 3.4.4-1ubuntu2) but 3.4.2-4ubuntu1 is installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Unable to correct dependencies```

Similar issue here: https://askubuntu.com/questions/1238254/partial-upgrade-to-20-04-lts-incorrect-version-of-libapt-pkg — pLumo, Aug 28 '20 at 07:01
@sonuishaq, I tried but this came up for a lot of packages Depends: , but it is not installed followed by Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution). Afterwards I apt --fix-broken install which gave Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root? — Dude901, Aug 28 '20 at 10:06
@Dude901 It says "are you root?", which means you'll need sudo. sudo apt --fix-broken install — Archisman Panigrahi, Aug 29 '20 at 11:38
@ArchismanPanigrahi I did use sudo, the snap is of the same. I'll share the complete output. — Dude901, Aug 29 '20 at 11:53
hi Any solution to this problem? I faced the same thing today and now I cant install anything using apt-get — jarvo69, Oct 21 '20 at 14:19
@SumitBadaya No, nothing worked out for me so I had to reinstall. — Dude901, Oct 22 '20 at 11:31
yeah same here...I also reinstalled from a ISO file and then only it worked out. Lost some data but took backup of imp stuff before reinstalling — jarvo69, Oct 24 '20 at 14:37

David · Answer 1 · 2021-10-30T18:57:07.763

Perhaps someone can explain why the following worked for me.

My upgrade from Ubuntu 18 to 20 was interrupted and I knew it was not completed. So I ran sudo apt update and sudo apt upgrade and got the following errors which are very similar to the OP's.

sudo apt update
Traceback (most recent call last):
  File "/usr/lib/cnf-update-db", line 8, in <module>
    from CommandNotFound.db.creator import DbCreator
  File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 11, in <module>
    import apt_pkg
ImportError: libapt-pkg.so.6.0: cannot open shared object file: No such file or directory
Reading package lists... Done
E: Problem executing scripts APT::Update::Post-Invoke-Success 'if /usr/bin/test -w /var/lib/command-not-found/ -a -e /usr/lib/cnf-update-db; then /usr/lib/cnf-update-db > /dev/null; fi'
E: Sub-process returned an error code

sudo apt upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 gnupg : Depends: gpgv (>= 2.2.19-3ubuntu2.1) but 2.2.4-1ubuntu1.4 is installed
 gnupg-utils : Depends: libreadline8 (>= 6.0) but it is not installed
 gpg : Depends: libreadline8 (>= 6.0) but it is not installed
 gpgconf : Depends: libreadline8 (>= 6.0) but it is not installed
 gpgsm : Depends: libreadline8 (>= 6.0) but it is not installed
 grub-common : Depends: libefiboot1 (>= 37) but it is not installed
               Depends: libefivar1 (>= 37) but it is not installed
 grub2-common : Depends: libefiboot1 (>= 37) but it is not installed
                Depends: libefivar1 (>= 37) but it is not installed
 initramfs-tools-core : Depends: initramfs-tools-bin (= 0.136ubuntu6.6) but 0.130ubuntu3.13 is installed
                        Depends: lz4 but it is not installed
 klibc-utils : Depends: libklibc (= 2.0.7-1ubuntu5) but 2.0.4-9ubuntu2 is installed
 libpython3.8-stdlib : Depends: libreadline8 (>= 7.0~beta) but it is not installed
 python3-apt : Depends: libapt-pkg6.0 (>= 1.9.11~) but it is not installed
 systemd-sysv : Depends: systemd (= 245.4-4ubuntu3.13) but 237-3ubuntu10.52 is installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

running sudo apt --fix-broken install

did not resolve any of them. However, I then ran all of the following commands:

sudo apt --fix-broken install gnupg
sudo apt --fix-broken install gnupg-utils
sudo apt --fix-broken install gpg
sudo apt --fix-broken install gpgconf
sudo apt --fix-broken install gpgsm
sudo apt --fix-broken install grub-common
sudo apt --fix-broken install grub2-common
sudo apt --fix-broken install initramfs-tools-core
sudo apt --fix-broken install klibc-utils
sudo apt --fix-broken install libpython3.8-stdlib
sudo apt --fix-broken install python3-apt
sudo apt --fix-broken install systemd-sysv

Note that after running each of these commands, it seemed that I was making no progress (the same error message above, was displayed after each -- The following packages have unmet dependencies: with the list of dependencies displayed after running each of these commands).

However, after running all of those commands, the following worked:

sudo apt --fix-broken install

After rebooting and running sudo apt update and sudo apt upgrade, the upgrade from Ubuntu 18 to Ubuntu 20 was complete.

This post explains some other commands which when done first, apparently allowed apt --fix-broken install to work. — David, Oct 30 '21 at 02:03
Top tip: Starting an answer with Perhaps someone can explain why the following worked for me. makes it look like a question-posted-as-an-answer — Greenonline, Oct 30 '21 at 03:22
@Greenonline Which is more important -- looking like an answer, or being an answer? It is a partial answer which is better than nothing, and is up front about being imperfect and incomplete. You are invited to edit it and make it better, or offer a competing more perfect and more complete answer. There is such a thing as a partial answer, which may include further questions and barely begin to answer the original question; such partial answers from novices may in some cases enrich the community as much as perfect answers from experts. Perfect is the enemy of the good. — David, Oct 30 '21 at 18:53

Cannot update after 20.04 version

1 Answers1