I own several remote VPS servers and I see this error on many of them ... here is one example which happend on May 22 2019 Ubuntu 18.04.2 LTS Linux-4.15.0-50-generic-x86_64-with-Ubuntu-18.04-bionic DEBIAN_FRONTEND=noninteractive sudo apt-get update && DEBIAN_FRONTEND=noninteractive sudo apt-get --fix-broken install -y Hit:1 http://nova.clouds.archive.ubuntu.com/ubuntu bionic InRelease Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB] Hit:3 https://download.docker.com/linux/ubuntu bionic InRelease Get:4 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB] Get:5 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB] Get:6 http://security.ubuntu.com/ubuntu bionic-security/main Sources [90.6 kB] Get:7 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages [349 kB] Fetched 692 kB in 1s (647 kB/s) Reading package lists... Reading package lists... Building dependency tree... Reading state information... 0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded. DEBIAN_FRONTEND=noninteractive sudo apt-get -f install -y Reading package lists... Building dependency tree... Reading state information... 0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded. sudo env DEBIAN_FRONTEND=noninteractive UCF_FORCE_CONFFNEW=YES apt-get -o Dpkg::Options::=--force-confnew -yy dist-upgrade -yq Reading package lists... Building dependency tree... Reading state information... Calculating upgrade... The following packages will be upgraded: curl libcurl3-gnutls libcurl4 mdadm netplan.io nplan python3-distupgrade python3-software-properties python3-urllib3 software-properties-common ubuntu-release-upgrader-core 11 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 643 kB/1,314 kB of archives. After this operation, 17.4 kB of additional disk space will be used. Get:1 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates/main amd64 netplan.io amd64 0.97-0ubuntu1~18.04.1 [60.6 kB] Get:2 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates/main amd64 nplan all 0.97-0ubuntu1~18.04.1 [1,800 B] Get:3 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates/main amd64 ubuntu-release-upgrader-core all 1:18.04.33 [25.1 kB] Get:4 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates/main amd64 python3-distupgrade all 1:18.04.33 [107 kB] Get:5 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates/main amd64 mdadm amd64 4.1~rc1-3~ubuntu18.04.2 [416 kB] Get:6 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates/main amd64 software-properties-common all 0.96.24.32.8 [9,992 B] Get:7 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates/main amd64 python3-software-properties all 0.96.24.32.8 [23.7 kB] Preconfiguring packages ... Fetched 643 kB in 1s (598 kB/s) (Reading database ... 30% Preparing to unpack .../00-netplan.io_0.97-0ubuntu1~18.04.1_amd64.deb ... Unpacking netplan.io (0.97-0ubuntu1~18.04.1) over (0.96-0ubuntu0.18.04.4) ... Preparing to unpack .../01-nplan_0.97-0ubuntu1~18.04.1_all.deb ... Unpacking nplan (0.97-0ubuntu1~18.04.1) over (0.96-0ubuntu0.18.04.4) ... Preparing to unpack .../02-ubuntu-release-upgrader-core_1%3a18.04.33_all.deb ... Unpacking ubuntu-release-upgrader-core (1:18.04.33) over (1:18.04.32) ... Preparing to unpack .../03-python3-distupgrade_1%3a18.04.33_all.deb ... Unpacking python3-distupgrade (1:18.04.33) over (1:18.04.32) ... Preparing to unpack .../04-curl_7.58.0-2ubuntu3.7_amd64.deb ... Unpacking curl (7.58.0-2ubuntu3.7) over (7.58.0-2ubuntu3.6) ... Preparing to unpack .../05-libcurl4_7.58.0-2ubuntu3.7_amd64.deb ... Unpacking libcurl4:amd64 (7.58.0-2ubuntu3.7) over (7.58.0-2ubuntu3.6) ... Preparing to unpack .../06-libcurl3-gnutls_7.58.0-2ubuntu3.7_amd64.deb ... Unpacking libcurl3-gnutls:amd64 (7.58.0-2ubuntu3.7) over (7.58.0-2ubuntu3.6) ... Preparing to unpack .../07-mdadm_4.1~rc1-3~ubuntu18.04.2_amd64.deb ... Unpacking mdadm (4.1~rc1-3~ubuntu18.04.2) over (4.1~rc1-3~ubuntu18.04.1) ... Preparing to unpack .../08-software-properties-common_0.96.24.32.8_all.deb ... Unpacking software-properties-common (0.96.24.32.8) over (0.96.24.32.7) ... Preparing to unpack .../09-python3-software-properties_0.96.24.32.8_all.deb ... Unpacking python3-software-properties (0.96.24.32.8) over (0.96.24.32.7) ... Preparing to unpack .../10-python3-urllib3_1.22-1ubuntu0.18.04.1_all.deb ... Unpacking python3-urllib3 (1.22-1ubuntu0.18.04.1) over (1.22-1) ... Processing triggers for ureadahead (0.100.0-21) ... Setting up libcurl3-gnutls:amd64 (7.58.0-2ubuntu3.7) ... Setting up libcurl4:amd64 (7.58.0-2ubuntu3.7) ... Setting up netplan.io (0.97-0ubuntu1~18.04.1) ... Setting up mdadm (4.1~rc1-3~ubuntu18.04.2) ... update-initramfs: deferring update (trigger activated) Sourcing file `/etc/default/grub' Sourcing file `/etc/default/grub.d/50-cloudimg-settings.cfg' Generating grub configuration file ... Found linux image: /boot/vmlinuz-4.15.0-50-generic Found initrd image: /boot/initrd.img-4.15.0-50-generic Found linux image: /boot/vmlinuz-4.15.0-48-generic Found initrd image: /boot/initrd.img-4.15.0-48-generic File descriptor 3 (pipe:[5141714]) leaked on lvs invocation. Parent PID 2982: /bin/sh done update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults Processing triggers for libc-bin (2.27-3ubuntu1) ... Setting up nplan (0.97-0ubuntu1~18.04.1) ... Processing triggers for systemd (237-3ubuntu10.21) ... Processing triggers for man-db (2.8.3-2ubuntu0.1) ... Setting up python3-software-properties (0.96.24.32.8) ... Setting up python3-urllib3 (1.22-1ubuntu0.18.04.1) ... Processing triggers for dbus (1.12.2-1ubuntu1) ... Setting up python3-distupgrade (1:18.04.33) ... Setting up software-properties-common (0.96.24.32.8) ... Setting up curl (7.58.0-2ubuntu3.7) ... Setting up ubuntu-release-upgrader-core (1:18.04.33) ... Processing triggers for initramfs-tools (0.130ubuntu3.7) ... update-initramfs: Generating /boot/initrd.img-4.15.0-50-generic I have several other examples of same error all happened to be using Ubuntu 18.04.2 LTS Linux-4.15.0-50-generic-x86_64-with-Ubuntu-18.04-bionic