I also encountered this issue recently, FYI, I build a docker image base on Debian OS daily, and some specific commands (install some packages, e.g. python, postgresql-client) will be ran during the building, since Oct 11, get the following error, ref: =================================================  docker: + apt-get -y install postgresql-client-9.6  docker: Reading package lists...  docker: Building dependency tree...  docker: Reading state information...  docker: The following additional packages will be installed:  docker: gcc-10-base libc-bin libc6 libcom-err2 libcomerr2 libcrypt1 libgcc-s1  docker: libgssapi-krb5-2 libidn2-0 libk5crypto3 libkrb5-3 libkrb5support0 libnss-nis  docker: libnss-nisplus libpq5 libreadline8 libtinfo6 postgresql-client-common  docker: Suggested packages:  docker: glibc-doc libc-l10n locales krb5-doc krb5-user postgresql-9.6  docker: postgresql-doc-9.6  docker: Recommended packages:  docker: manpages krb5-locales  docker: The following NEW packages will be installed:  docker: gcc-10-base libcom-err2 libcrypt1 libgcc-s1 libnss-nis libnss-nisplus libpq5  docker: libreadline8 libtinfo6 postgresql-client-9.6 postgresql-client-common  docker: The following packages will be upgraded:  docker: libc-bin libc6 libcomerr2 libgssapi-krb5-2 libidn2-0 libk5crypto3 libkrb5-3  docker: libkrb5support0  docker: 8 upgraded, 11 newly installed, 0 to remove and 304 not upgraded.  docker: Need to get 6960 kB of archives.  docker: After this operation, 11.2 MB of additional disk space will be used.  docker: Get:1 http://security.debian.org stretch/updates/main amd64 postgresql-client-9.6 amd64 9.6.19-0+deb9u1 [1288 kB]  docker: Get:2 http://ftp.de.debian.org/debian sid/main amd64 gcc-10-base amd64 10.2.0-15 [199 kB]  docker: Get:3 http://ftp.de.debian.org/debian sid/main amd64 libgcc-s1 amd64 10.2.0-15 [41.4 kB]  docker: Get:4 http://ftp.de.debian.org/debian sid/main amd64 libnss-nis amd64 3.1-3 [25.6 kB]  docker: Get:5 http://ftp.de.debian.org/debian sid/main amd64 libnss-nisplus amd64 1.3-3 [21.6 kB]  docker: Get:6 http://ftp.de.debian.org/debian sid/main amd64 libc6 amd64 2.31-4 [2804 kB]  docker: Get:7 http://ftp.de.debian.org/debian sid/main amd64 libcrypt1 amd64 1:4.4.17-1 [86.9 kB]  docker: Get:8 http://ftp.de.debian.org/debian sid/main amd64 libc-bin amd64 2.31-4 [804 kB]  docker: Get:9 http://ftp.de.debian.org/debian sid/main amd64 libcom-err2 amd64 1.45.6-1 [71.7 kB]  docker: Get:10 http://ftp.de.debian.org/debian sid/main amd64 libcomerr2 amd64 1.45.6-1 [67.6 kB]  docker: Get:11 http://ftp.de.debian.org/debian sid/main amd64 libtinfo6 amd64 6.2+20200918-1 [340 kB]  docker: Get:12 http://ftp.de.debian.org/debian sid/main amd64 libreadline8 amd64 8.0-4 [160 kB]  docker: Get:13 http://ftp.de.debian.org/debian sid/main amd64 libgssapi-krb5-2 amd64 1.17-10 [156 kB]  docker: Get:14 http://ftp.de.debian.org/debian sid/main amd64 libkrb5-3 amd64 1.17-10 [366 kB]  docker: Get:15 http://ftp.de.debian.org/debian sid/main amd64 libk5crypto3 amd64 1.17-10 [115 kB]  docker: Get:16 http://ftp.de.debian.org/debian sid/main amd64 libkrb5support0 amd64 1.17-10 [64.6 kB]  docker: Get:17 http://ftp.de.debian.org/debian sid/main amd64 libidn2-0 amd64 2.3.0-1 [85.4 kB]  docker: Get:18 http://ftp.de.debian.org/debian sid/main amd64 libpq5 amd64 13.0-3 [174 kB]  docker: Get:19 http://ftp.de.debian.org/debian sid/main amd64 postgresql-client-common all 220 [88.3 kB]  docker: debconf: delaying package configuration, since apt-utils is not installed  docker: Fetched 6960 kB in 2s (3400 kB/s)  docker: Selecting previously unselected package gcc-10-base:amd64.  docker: (Reading database ... 27106 files and directories currently installed.)  docker: Preparing to unpack .../gcc-10-base_10.2.0-15_amd64.deb ...  docker: Unpacking gcc-10-base:amd64 (10.2.0-15) ...  docker: Setting up gcc-10-base:amd64 (10.2.0-15) ...  docker: Selecting previously unselected package libgcc-s1:amd64.  docker: (Reading database ... 27111 files and directories currently installed.)  docker: Preparing to unpack .../libgcc-s1_10.2.0-15_amd64.deb ...  docker: Unpacking libgcc-s1:amd64 (10.2.0-15) ...  docker: Replacing files in old package libgcc1:amd64 (1:6.3.0-18) ...  docker: Setting up libgcc-s1:amd64 (10.2.0-15) ...  docker: (Reading database ... 27113 files and directories currently installed.)  docker: Preparing to unpack .../libc6_2.31-4_amd64.deb ...  docker: debconf: unable to initialize frontend: Dialog  docker: debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)  docker: debconf: falling back to frontend: Readline  docker: debconf: unable to initialize frontend: Readline  docker: debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.24.1 /usr/local/share/perl/5.24.1 /usr/lib/x86_64-linux-gnu/perl5/5.24 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.24 /usr/share/perl/5.24 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base .) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.)  docker: debconf: falling back to frontend: Teletype  docker: Checking for services that may need to be restarted...  docker: Checking init scripts...  docker: Unpacking libc6:amd64 (2.31-4) over (2.24-11+deb9u1) ...  docker: Selecting previously unselected package libnss-nis:amd64.  docker: Preparing to unpack .../libnss-nis_3.1-3_amd64.deb ...  docker: Unpacking libnss-nis:amd64 (3.1-3) ...  docker: Selecting previously unselected package libcrypt1:amd64.  docker: Preparing to unpack .../libcrypt1_1%3a4.4.17-1_amd64.deb ...  docker: Unpacking libcrypt1:amd64 (1:4.4.17-1) ...  docker: Selecting previously unselected package libnss-nisplus:amd64.  docker: Preparing to unpack .../libnss-nisplus_1.3-3_amd64.deb ...  docker: Unpacking libnss-nisplus:amd64 (1.3-3) ...  docker: Setting up libnss-nis:amd64 (3.1-3) ...  docker: Setting up libcrypt1:amd64 (1:4.4.17-1) ...  docker: Setting up libnss-nisplus:amd64 (1.3-3) ...  docker: Setting up libc6:amd64 (2.31-4) ...  docker: Installing new version of config file /etc/ld.so.conf.d/x86_64-linux-gnu.conf ...  docker: debconf: unable to initialize frontend: Dialog  docker: debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)  docker: debconf: falling back to frontend: Readline  docker: debconf: unable to initialize frontend: Readline  docker: debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.24.1 /usr/local/share/perl/5.24.1 /usr/lib/x86_64-linux-gnu/perl5/5.24 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.24 /usr/share/perl/5.24 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base .) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.)  docker: debconf: falling back to frontend: Teletype  docker: Checking for services that may need to be restarted...  docker: Checking init scripts...  docker: Nothing to restart.  docker: (Reading database ... 27125 files and directories currently installed.)  docker: Preparing to unpack .../libc-bin_2.31-4_amd64.deb ...  docker: Unpacking libc-bin (2.31-4) over (2.24-11+deb9u1) ...  docker: Setting up libc-bin (2.31-4) ...  docker: Updating /etc/nsswitch.conf to current default.  docker: (Reading database ... 27125 files and directories currently installed.)  docker: Preparing to unpack .../libcomerr2_1.45.6-1_amd64.deb ...  docker: Unpacking libcomerr2:amd64 (1.45.6-1) over (1.43.4-2) ...  docker: Selecting previously unselected package libcom-err2:amd64.  docker: Preparing to unpack .../libcom-err2_1.45.6-1_amd64.deb ...  docker: Unpacking libcom-err2:amd64 (1.45.6-1) ...  docker: Setting up libcom-err2:amd64 (1.45.6-1) ...  docker: Selecting previously unselected package libtinfo6:amd64.  docker: (Reading database ... 27128 files and directories currently installed.)  docker: Preparing to unpack .../0-libtinfo6_6.2+20200918-1_amd64.deb ...  docker: Unpacking libtinfo6:amd64 (6.2+20200918-1) ...  docker: Selecting previously unselected package libreadline8:amd64.  docker: Preparing to unpack .../1-libreadline8_8.0-4_amd64.deb ...  docker: Unpacking libreadline8:amd64 (8.0-4) ...  docker: Preparing to unpack .../2-libgssapi-krb5-2_1.17-10_amd64.deb ...  docker: Unpacking libgssapi-krb5-2:amd64 (1.17-10) over (1.15-1+deb9u1) ...  docker: Preparing to unpack .../3-libkrb5-3_1.17-10_amd64.deb ...  docker: Unpacking libkrb5-3:amd64 (1.17-10) over (1.15-1+deb9u1) ...  docker: Preparing to unpack .../4-libk5crypto3_1.17-10_amd64.deb ...  docker: Unpacking libk5crypto3:amd64 (1.17-10) over (1.15-1+deb9u1) ...  docker: Preparing to unpack .../5-libkrb5support0_1.17-10_amd64.deb ...  docker: Unpacking libkrb5support0:amd64 (1.17-10) over (1.15-1+deb9u1) ...  docker: Preparing to unpack .../6-libidn2-0_2.3.0-1_amd64.deb ...  docker: Unpacking libidn2-0:amd64 (2.3.0-1) over (0.16-1+deb9u1) ...  docker: Selecting previously unselected package libpq5:amd64.  docker: Preparing to unpack .../7-libpq5_13.0-3_amd64.deb ...  docker: Unpacking libpq5:amd64 (13.0-3) ...  docker: Selecting previously unselected package postgresql-client-common.  docker: Preparing to unpack .../8-postgresql-client-common_220_all.deb ...  docker: Unpacking postgresql-client-common (220) ...  docker: Selecting previously unselected package postgresql-client-9.6.  docker: Preparing to unpack .../9-postgresql-client-9.6_9.6.19-0+deb9u1_amd64.deb ...  docker: Unpacking postgresql-client-9.6 (9.6.19-0+deb9u1) ...  docker: Setting up libidn2-0:amd64 (2.3.0-1) ...  docker: Setting up libtinfo6:amd64 (6.2+20200918-1) ...  docker: Setting up libkrb5support0:amd64 (1.17-10) ...  docker: Processing triggers for libc-bin (2.31-4) ...  docker: Setting up postgresql-client-common (220) ...  docker: Setting up libcomerr2:amd64 (1.45.6-1) ...  docker: Setting up libreadline8:amd64 (8.0-4) ...  docker: Setting up libk5crypto3:amd64 (1.17-10) ...  docker: Setting up libkrb5-3:amd64 (1.17-10) ...  docker: Setting up libgssapi-krb5-2:amd64 (1.17-10) ...  docker: Setting up libpq5:amd64 (13.0-3) ...  docker: Setting up postgresql-client-9.6 (9.6.19-0+deb9u1) ...  docker: update-alternatives: using /usr/share/postgresql/9.6/man/man1/psql.1.gz to provide /usr/share/man/man1/psql.1.gz (psql.1.gz) in auto mode  docker: Processing triggers for libc-bin (2.31-4) ...  docker: E: Could not configure 'libc6:amd64'.  docker: E: Could not perform immediate configuration on 'libcrypt1:amd64'. Please see man 5 apt.conf under APT::Immediate-Configure for details. (2) ==> docker: Killing the container: f7f06a04876e2964be28ddbd394cb73b1fb20da6043d615494cf070ac2e16e0b Build 'docker' errored: Script exited with non-zero exit status: 100 ======================================= Note: Before 'apt-get -y install postgresql-client-9.6', 'apt-get -y update' is ran.