*I get the same result as @Hayden (https://launchpad.net/~recalcitrantowl):* m*****o@M*****Z:~$ sudo apt update Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB] Hit:2 http://archive.ubuntu.com/ubuntu bionic InRelease Get:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [83.2 kB] Hit:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease Get:5 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages [72.4 kB] Get:6 http://security.ubuntu.com/ubuntu bionic-security/main Translation-en [26.0 kB] Get:7 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 Packages [16.8 kB]Get:8 http://security.ubuntu.com/ubuntu bionic-security/universe Translation-en [8540 B] Get:9 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [102 kB] Get:10 http://archive.ubuntu.com/ubuntu bionic-updates/main Translation-en [38.0 kB] Get:11 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [63.6 kB] Get:12 http://archive.ubuntu.com/ubuntu bionic-updates/universe Translation-en [27.9 kB] Fetched 522 kB in 18s (29.3 kB/s) Reading package lists... Done Building dependency tree Preparing to unpack .../1-ubuntu-release-upgrader-core_1%3a18.04.18_all.deb ... Unpacking ubuntu-release-upgrader-core (1:18.04.18) over (1:18.04.17) ... Preparing to unpack .../2-python3-distupgrade_1%3a18.04.18_all.deb ... Unpacking python3-distupgrade (1:18.04.18) over (1:18.04.17) ... Preparing to unpack .../3-ebtables_2.0.10.4-3.5ubuntu2.18.04.1_amd64.deb ... invoke-rc.d: could not determine current runlevel * Error: insufficient privileges to access the ebtables rulesets. invoke-rc.d: initscript ebtables, action "stop" failed. dpkg: warning: old ebtables package pre-removal script subprocess returned error exit status 1 dpkg: trying script from the new package instead ... invoke-rc.d: could not determine current runlevel * Error: insufficient privileges to access the ebtables rulesets. invoke-rc.d: initscript ebtables, action "stop" failed. dpkg: error processing archive /tmp/apt-dpkg-install-2xpgP8/3-ebtables_2.0.10.4-3.5ubuntu2.18.04.1_amd64.deb (--unpack): new ebtables package pre-removal script subprocess returned error exit status 1 dmesg: read kernel buffer failed: Function not implemented update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults invoke-rc.d: could not determine current runlevel Preparing to unpack .../4-software-properties-common_0.96.24.32.3_all.deb ... Unpacking software-properties-common (0.96.24.32.3) over (0.96.24.32.2) ... Preparing to unpack .../5-python3-software-properties_0.96.24.32.3_all.deb ... Unpacking python3-software-properties (0.96.24.32.3) over (0.96.24.32.2) ... Errors were encountered while processing: Calculating upgrade... Done The following packages will be upgraded: ebtables 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 5 not fully installed or removed. Need to get 0 B/79.9 kB of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] Y (Reading database ... 28662 files and directories currently installed.) Preparing to unpack .../ebtables_2.0.10.4-3.5ubuntu2.18.04.1_amd64.deb ... invoke-rc.d: could not determine current runlevel * Error: insufficient privileges to access the ebtables rulesets. invoke-rc.d: initscript ebtables, action "stop" failed. dpkg: warning: old ebtables package pre-removal script subprocess returned error exit status 1 dpkg: trying script from the new package instead ... invoke-rc.d: could not determine current runlevel * Error: insufficient privileges to access the ebtables rulesets. invoke-rc.d: initscript ebtables, action "stop" failed. dpkg: error processing archive /var/cache/apt/archives/ebtables_2.0.10.4-3.5ubuntu2.18.04.1_amd64.deb (--unpack): new ebtables package pre-removal script subprocess returned error exit status 1 update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults invoke-rc.d: could not determine current runlevel Errors were encountered while processing: /var/cache/apt/archives/ebtables_2.0.10.4-3.5ubuntu2.18.04.1_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1)