Handling Dependency Errors During Docker Installation on Ubuntu 18.04

I am a beginner with Linux and I am trying to install Docker on an instance that has Ubuntu 18.04.4 LTS (GNU/Linux 4.15.0-106-generic x86_64). I am following the guide I found here: https://docs.docker.com/engine/install/ubuntu/

The first step involves running this series of commands:

sudo apt-get updatesudo apt-get install ca-certificates curl

However, when I try to run sudo apt-get install ca-certificates curl, I get an error saying:

$ sudo apt-get install ca-certificates curlReading package lists... DoneBuilding dependency treeReading state information... DoneYou might want to run 'apt --fix-broken install' to correct these.The following packages have unmet dependencies: apt : Depends: adduser but it is not going to be installed       Depends: gpgv but it is not going to be installed or                gpgv2 but it is not going to be installed or                gpgv1 but it is not going to be installed       Depends: ubuntu-keyring but it is not going to be installed       Depends: libapt-pkg5.0 (>= 1.6.12ubuntu0.2) but it is not going to be installed       Depends: libc6 (>= 2.15) but it is not going to be installed       Depends: libgnutls30 (>= 3.5.6) but it is not going to be installed       Depends: libseccomp2 (>= 1.0.1) but it is not going to be installed ca-certificates : Depends: openssl (>= 1.1.0) but it is not going to be installed                   Depends: debconf (>= 0.5) but it is not going to be installed or                            debconf-2.0 curl : Depends: libc6 (>= 2.17) but it is not going to be installed        Depends: libcurl4 (= 7.58.0-2ubuntu3.24) but it is not going to be installed        Depends: zlib1g (>= 1:1.1.4) but it is not going to be installed libgcc1 : Depends: libc6 (>= 2.14) but it is not going to be installed libstdc++6 : Depends: libc6 (>= 2.18) but it is not going to be installedE: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

When I try to do what the error suggests, that is, run the command apt --fix-broken install, it doesn't work and throws the following error:

E: Cannot get debconf version. Is debconf installed?debconf: apt-extracttemplates failed: No such file or directoryExtracting templates from packages: 56%E: Cannot get debconf version. Is debconf installed?debconf: apt-extracttemplates failed: No such file or directoryExtracting templates from packages: 100%(Reading database ... 609 files and directories currently installed.)Preparing to unpack .../libc6_2.27-3ubuntu1.6_amd64.deb ...open2: Illegal seek at /usr/share/perl/5.26/IPC/Open3.pm line 210.dpkg: error processing archive /var/cache/apt/archives/libc6_2.27-3ubuntu1.6_amd64.deb (--unpack): new libc6:amd64 package pre-installation script subprocess returned error exit status 29Errors were encountered while processing: /var/cache/apt/archives/libc6_2.27-3ubuntu1.6_amd64.debE: Sub-process /usr/bin/dpkg returned an error code (1)

What can I do?

I am trying to install Docker on an instance that has Ubuntu 18.04.4 LTS (GNU/Linux 4.15.0-106-generic x86_64).